diff --git a/ASTExtension/ASTExtension.csproj b/ASTExtension/ASTExtension.csproj
new file mode 100644
index 0000000..78195e6
--- /dev/null
+++ b/ASTExtension/ASTExtension.csproj
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <RootNamespace>ASTExtension</RootNamespace>
+  </PropertyGroup>
+</Project>
diff --git a/ASTExtension/Extensions/PlayerSetupExtensions.cs b/ASTExtension/Extensions/PlayerSetupExtensions.cs
new file mode 100644
index 0000000..dd8dd5c
--- /dev/null
+++ b/ASTExtension/Extensions/PlayerSetupExtensions.cs
@@ -0,0 +1,17 @@
+using ABI_RC.Core.Player;
+using UnityEngine;
+
+namespace NAK.ASTExtension.Extensions;
+
+public static class PlayerSetupExtensions
+{
+    // immediate measurement of the player's avatar height
+    public static float GetCurrentAvatarHeight(this PlayerSetup playerSetup)
+    {
+        Vector3 localScale = playerSetup._avatar.transform.localScale;
+        Vector3 initialScale = playerSetup.initialScale;
+        float initialHeight = playerSetup._initialAvatarHeight;
+        Vector3 scaleDifference = PlayerSetup.DivideVectors(localScale - initialScale, initialScale);
+        return initialHeight + initialHeight * scaleDifference.y;
+    }
+}
\ No newline at end of file
diff --git a/ASTExtension/Main.cs b/ASTExtension/Main.cs
new file mode 100644
index 0000000..756119e
--- /dev/null
+++ b/ASTExtension/Main.cs
@@ -0,0 +1,365 @@
+using ABI_RC.Core.InteractionSystem;
+using ABI_RC.Core.Player;
+using ABI_RC.Core.Savior;
+using ABI_RC.Core.Util.AnimatorManager;
+using ABI_RC.Systems.GameEventSystem;
+using ABI_RC.Systems.InputManagement;
+using ABI.CCK.Components;
+using MelonLoader;
+using NAK.ASTExtension.Extensions;
+using UnityEngine;
+
+namespace NAK.ASTExtension;
+
+public class ASTExtensionMod : MelonMod
+{
+    private static MelonLogger.Instance Logger;
+
+    #region Melon Preferences
+
+    private static readonly MelonPreferences_Category Category =
+        MelonPreferences.CreateCategory(nameof(ASTExtension));
+
+    private static readonly MelonPreferences_Entry<bool> EntryUseScaleGesture =
+        Category.CreateEntry("use_scale_gesture", true,
+            "Use Scale Gesture", "Use the scale gesture to adjust your avatar's height.");
+
+    private static readonly MelonPreferences_Entry<bool> EntryUseCustomParameter =
+        Category.CreateEntry("use_custom_parameter", false,
+            "Use Custom Parameter", "Use a custom parameter to adjust your avatar's height.");
+
+    private static readonly MelonPreferences_Entry<string> EntryCustomParameterName =
+        Category.CreateEntry("custom_parameter_name", "AvatarScale",
+            "Custom Parameter Name", "The name of the custom parameter to use for height adjustment.");
+
+    private static readonly MelonPreferences_Entry<bool> EntryPersistentHeight =
+        Category.CreateEntry("persistent_height", false,
+            "Persistent Height", "Should the avatar height persist between avatar switches?");
+
+    private static readonly MelonPreferences_Entry<bool> EntryPersistThroughRestart =
+        Category.CreateEntry("persistent_height_through_restart", false,
+            "Persist Through Restart", "Should the avatar height persist between game restarts?");
+
+    private static readonly MelonPreferences_Entry<bool> EntryPersistFromUnsupported
+        = Category.CreateEntry("persist_from_unsupported", false,
+            "Persist From Unsupported", "Should the avatar height persist when the avatar is unsupported?");
+
+    // stores the last avatar height as a melon pref
+    private static readonly MelonPreferences_Entry<float> EntryHiddenAvatarHeight =
+        Category.CreateEntry("hidden_avatar_height", -2f, is_hidden: true);
+
+    private void InitializeSettings()
+    {
+        EntryUseCustomParameter.OnEntryValueChangedUntyped.Subscribe(OnUseCustomParameterChanged);
+        EntryCustomParameterName.OnEntryValueChangedUntyped.Subscribe(OnCustomParameterNameChanged);
+        OnUseCustomParameterChanged();
+    }
+
+    private void OnUseCustomParameterChanged(object oldValue = null, object newValue = null)
+    {
+        SetupCustomParameter();
+    }
+
+    private void OnCustomParameterNameChanged(object oldValue = null, object newValue = null)
+    {
+        SetupCustomParameter();
+    }
+
+    private void SetupCustomParameter()
+    {
+        // use custom parameter
+        if (EntryUseCustomParameter.Value)
+        {
+            _parameterName = EntryCustomParameterName.Value;
+            CalibrateCustomParameter();
+            return;
+        }
+
+        // reset to default
+        _parameterName = "AvatarScale";
+        _minHeight = GlobalMinHeight;
+        _maxHeight = GlobalMaxHeight;
+    }
+
+    #endregion Melon Preferences
+
+    #region Melon Events
+
+    public override void OnInitializeMelon()
+    {
+        Logger = LoggerInstance;
+
+        InitializeSettings();
+        InitializeScaleGesture();
+
+        CVRGameEventSystem.Avatar.OnLocalAvatarLoad.AddListener(OnLocalAvatarLoad);
+        CVRGameEventSystem.Avatar.OnLocalAvatarClear.AddListener(OnLocalAvatarClear);
+    }
+
+    #endregion Melon Events
+
+    #region Game Events
+
+    private void OnLocalAvatarLoad(CVRAvatar _)
+    {
+        _currentAvatarSupported = IsAvatarSupported();
+        if (!_currentAvatarSupported)
+            return;
+
+        if (EntryUseCustomParameter.Value
+            && !string.IsNullOrEmpty(_parameterName))
+            CalibrateCustomParameter();
+
+        if (EntryPersistThroughRestart.Value
+            && _lastHeight < 0) // has not been set
+        {
+            var lastHeight = EntryHiddenAvatarHeight.Value;
+            if (lastHeight > 0) SetAvatarHeight(lastHeight, true);
+            return;
+        }
+
+        if (EntryPersistentHeight.Value
+            && _lastHeight > 0) // has been set
+            SetAvatarHeight(_lastHeight);
+    }
+
+    private void OnLocalAvatarClear(CVRAvatar _)
+    {
+        _currentAvatarSupported = false;
+
+        if (!EntryPersistentHeight.Value)
+            return;
+
+        if (!IsAvatarSupported()
+            && !EntryPersistFromUnsupported.Value)
+            return;
+
+        // update the last height
+        var height = PlayerSetup.Instance.GetCurrentAvatarHeight();
+        _lastHeight = height;
+        EntryHiddenAvatarHeight.Value = height;
+    }
+
+    #endregion Game Events
+
+    #region Avatar Scale Tool
+
+    // todo: tool needs a dedicated parameter name
+    //private const string ASTParameterName = "ASTHeight";
+    //private const string ASTMotionParameterName = "#MotionScale";
+
+    //https://github.com/NotAKidoS/AvatarScaleTool/blob/eaa6d343f916b9bb834bb30989fc6987680492a2/AvatarScaleTool/Editor/Scripts/AvatarScaleTool.cs#L13-L14
+    private const float GlobalMinHeight = 0.25f;
+    private const float GlobalMaxHeight = 2.5f;
+
+    private string _parameterName = "AvatarScale";
+
+    private float _lastHeight = -1f;
+    private float _minHeight = GlobalMinHeight;
+    private float _maxHeight = GlobalMaxHeight;
+    private bool _currentAvatarSupported;
+
+    private float GetValueFromHeight(float height)
+    {
+        return Mathf.Clamp01((height - _minHeight) / (_maxHeight - _minHeight));
+    }
+
+    private float GetHeightFromValue(float value)
+    {
+        return Mathf.Lerp(_minHeight, _maxHeight, value);
+    }
+
+    private void SetAvatarHeight(float height, bool immediate = false)
+    {
+        if (!IsAvatarSupported())
+            return;
+
+        AvatarAnimatorManager animatorManager = PlayerSetup.Instance.animatorManager;
+        if (!animatorManager.IsInitialized)
+        {
+            Logger.Error("AnimatorManager is not initialized!");
+            return;
+        }
+
+        if (!animatorManager.HasParameter(_parameterName))
+        {
+            Logger.Error($"Parameter '{_parameterName}' does not exist!");
+            return;
+        }
+
+        Animator animator = animatorManager.Animator;
+        var value = GetValueFromHeight(height);
+        animator.SetFloat(_parameterName, value);
+        if (immediate) animator.Update(0f); // apply
+
+        _lastHeight = height; // session
+        EntryHiddenAvatarHeight.Value = height; // persistent
+
+        // update in menus
+        CVR_MenuManager.Instance.SendAdvancedAvatarUpdate(_parameterName, value);
+    }
+
+    private bool IsAvatarSupported()
+    {
+        // check if avatar has the parameter
+        AvatarAnimatorManager animatorManager = PlayerSetup.Instance.animatorManager;
+        if (!animatorManager.IsInitialized)
+        {
+            Logger.Error("AnimatorManager is not initialized!");
+            return false;
+        }
+
+        if (!animatorManager.HasParameter(_parameterName))
+        {
+            Logger.Error($"Parameter '{_parameterName}' does not exist!");
+            return false;
+        }
+
+        return true;
+    }
+
+    #endregion Avatar Scale Tool
+
+    #region Custom Parameter Calibration
+
+    private void CalibrateCustomParameter()
+    {
+        AvatarAnimatorManager animatorManager = PlayerSetup.Instance.animatorManager;
+        if (!animatorManager.IsInitialized)
+        {
+            Logger.Error("AnimatorManager is not initialized!");
+            return;
+        }
+
+        if (!animatorManager.HasParameter(_parameterName))
+        {
+            Logger.Error($"Parameter '{_parameterName}' does not exist!");
+            return;
+        }
+
+        Animator animator = animatorManager.Animator; // we get from animator manager to ensure we have *profile* param
+        animatorManager.GetParameter(_parameterName, out float initialValue);
+
+        // set min height to 0
+        animator.SetFloat(_parameterName, 0f);
+        animator.Update(0f); // apply
+        var minHeight = PlayerSetup.Instance.GetCurrentAvatarHeight();
+
+        // set max height to 1
+        animator.SetFloat(_parameterName, 1f);
+        animator.Update(0f); // apply
+        var maxHeight = PlayerSetup.Instance.GetCurrentAvatarHeight();
+
+        // reset the parameter to its initial value
+        animator.SetFloat(_parameterName, initialValue);
+        animator.Update(0f); // apply
+
+        Logger.Msg(
+            $"Calibrated custom parameter '{_parameterName}' with min height {minHeight} and max height {maxHeight}");
+    }
+
+    #endregion Custom Parameter Calibration
+
+    #region Scale Reconizer
+
+    // Require triggers to be down while doing fist - Exteratta
+    private readonly bool RequireTriggers = true;
+
+    // Initial values when scale gesture is started
+    private float _initialModifier;
+    private float _initialTargetHeight;
+
+    private void InitializeScaleGesture()
+    {
+        // This requires arms far outward- pull inward with fist and triggers.
+        // Release triggers while still holding fist to readjust.
+
+        CVRGesture gesture = new()
+        {
+            name = "astExtensionIn",
+            type = CVRGesture.GestureType.Hold
+        };
+        gesture.steps.Add(new CVRGestureStep
+        {
+            firstGesture = CVRGestureStep.Gesture.Fist,
+            secondGesture = CVRGestureStep.Gesture.Fist,
+            startDistance = 1f,
+            endDistance = 0.25f,
+            direction = CVRGestureStep.GestureDirection.MovingIn,
+            needsToBeInView = true
+        });
+        gesture.onStart.AddListener(OnScaleStart);
+        gesture.onStay.AddListener(OnScaleStay);
+        CVRGestureRecognizer.Instance.gestures.Add(gesture);
+
+        gesture = new CVRGesture
+        {
+            name = "astExtensionOut",
+            type = CVRGesture.GestureType.Hold
+        };
+        gesture.steps.Add(new CVRGestureStep
+        {
+            firstGesture = CVRGestureStep.Gesture.Fist,
+            secondGesture = CVRGestureStep.Gesture.Fist,
+            startDistance = 0.25f,
+            endDistance = 1f,
+            direction = CVRGestureStep.GestureDirection.MovingOut,
+            needsToBeInView = true
+        });
+        gesture.onStart.AddListener(OnScaleStart);
+        gesture.onStay.AddListener(OnScaleStay);
+        CVRGestureRecognizer.Instance.gestures.Add(gesture);
+    }
+
+    private void OnScaleStart(float modifier, Transform transform1, Transform transform2)
+    {
+        if (!_currentAvatarSupported)
+            return;
+
+        if (!EntryUseScaleGesture.Value)
+            return;
+
+        // Store initial modifier so we can get difference later
+        _initialModifier = Mathf.Max(modifier, 0.01f); // no zero
+        _initialTargetHeight = PlayerSetup.Instance.GetCurrentAvatarHeight();
+    }
+
+    private void OnScaleStay(float modifier, Transform transform1, Transform transform2)
+    {
+        if (!_currentAvatarSupported)
+            return;
+
+        if (!EntryUseScaleGesture.Value)
+            return;
+
+        modifier = Mathf.Max(modifier, 0.01f); // no zero
+
+        // Allow user to release triggers to reset "world grip"
+        if (RequireTriggers && !AreBothTriggersDown())
+        {
+            _initialModifier = modifier;
+            _initialTargetHeight = PlayerSetup.Instance.GetCurrentAvatarHeight();
+            return;
+        }
+
+        // Invert so the gesture is more of a world squish instead of happy hug
+        var modifierRatio = 1f / (modifier / _initialModifier);
+
+        // Determine the adjustment factor for the height, this will be >1 if scaling up, <1 if scaling down.
+        var heightAdjustmentFactor = modifierRatio > 1 ? 1 + (modifierRatio - 1) : 1 - (1 - modifierRatio);
+
+        // Apply the adjustment to the target height
+        var targetHeight = _initialTargetHeight * heightAdjustmentFactor;
+        targetHeight = Mathf.Clamp(targetHeight, _minHeight, _maxHeight);
+        SetAvatarHeight(targetHeight);
+    }
+
+    private static bool AreBothTriggersDown()
+    {
+        // Maybe it should be one trigger? Imagine XSOverlay scaling but for player.
+        return CVRInputManager.Instance.interactLeftValue > 0.75f &&
+               CVRInputManager.Instance.interactRightValue > 0.75f;
+    }
+
+    #endregion Scale Reconizer
+}
\ No newline at end of file
diff --git a/ASTExtension/Properties/AssemblyInfo.cs b/ASTExtension/Properties/AssemblyInfo.cs
new file mode 100644
index 0000000..747a7d8
--- /dev/null
+++ b/ASTExtension/Properties/AssemblyInfo.cs
@@ -0,0 +1,32 @@
+using MelonLoader;
+using NAK.ASTExtension.Properties;
+using System.Reflection;
+
+[assembly: AssemblyVersion(AssemblyInfoParams.Version)]
+[assembly: AssemblyFileVersion(AssemblyInfoParams.Version)]
+[assembly: AssemblyInformationalVersion(AssemblyInfoParams.Version)]
+[assembly: AssemblyTitle(nameof(NAK.ASTExtension))]
+[assembly: AssemblyCompany(AssemblyInfoParams.Author)]
+[assembly: AssemblyProduct(nameof(NAK.ASTExtension))]
+
+[assembly: MelonInfo(
+    typeof(NAK.ASTExtension.ASTExtensionMod),
+    nameof(NAK.ASTExtension),
+    AssemblyInfoParams.Version,
+    AssemblyInfoParams.Author,
+    downloadLink: "https://github.com/NotAKidoS/NAK_CVR_Mods/tree/main/ASTExtension"
+)]
+
+[assembly: MelonGame("Alpha Blend Interactive", "ChilloutVR")]
+[assembly: MelonPlatform(MelonPlatformAttribute.CompatiblePlatforms.WINDOWS_X64)]
+[assembly: MelonPlatformDomain(MelonPlatformDomainAttribute.CompatibleDomains.MONO)]
+[assembly: MelonColor(255, 246, 25, 99)] // red-pink
+[assembly: MelonAuthorColor(255, 158, 21, 32)] // red
+[assembly: HarmonyDontPatchAll]
+
+namespace NAK.ASTExtension.Properties;
+internal static class AssemblyInfoParams
+{
+    public const string Version = "1.0.0";
+    public const string Author = "NotAKidoS";
+}
\ No newline at end of file
diff --git a/ASTExtension/README.md b/ASTExtension/README.md
new file mode 100644
index 0000000..3957ef3
--- /dev/null
+++ b/ASTExtension/README.md
@@ -0,0 +1,20 @@
+# ASTExtension
+
+Extension mod for [Avatar Scale Tool](https://github.com/NotAKidoS/AvatarScaleTool):
+- VR Gesture to scale
+- Match IRL height
+- Persistent height
+- Copy height from others
+
+Requires setup in Unity. This is **not** Universal Scaling.
+
+---
+
+Here is the block of text where I tell you this mod is not affiliated with or endorsed by ABI. 
+https://documentation.abinteractive.net/official/legal/tos/#7-modding-our-games
+
+> This mod is an independent creation not affiliated with, supported by, or approved by Alpha Blend Interactive. 
+
+> Use of this mod is done so at the user's own risk and the creator cannot be held responsible for any issues arising from its use.
+
+> To the best of my knowledge, I have adhered to the Modding Guidelines established by Alpha Blend Interactive.
diff --git a/ASTExtension/format.json b/ASTExtension/format.json
new file mode 100644
index 0000000..466398d
--- /dev/null
+++ b/ASTExtension/format.json
@@ -0,0 +1,24 @@
+{
+  "_id": -1,
+  "name": "ASTExtension",
+  "modversion": "1.0.0",
+  "gameversion": "2024r175",
+  "loaderversion": "0.6.1",
+  "modtype": "Mod",
+  "author": "NotAKidoS",
+  "description": "Extension mod for [Avatar Scale Tool](https://github.com/NotAKidoS/AvatarScaleTool):\n- VR Gesture to scale\n- Match IRL height\n- Persistent height\n- Copy height from others\n\nRequires setup in Unity. This is **not** Universal Scaling.",
+  "searchtags": [
+    "tool",
+    "scaling",
+    "height",
+    "extension",
+    "avatar"
+  ],
+  "requirements": [
+    "None"
+  ],
+  "downloadlink": "https://github.com/NotAKidoS/NAK_CVR_Mods/releases/download/r33/ASTExtension.dll",
+  "sourcelink": "https://github.com/NotAKidoS/NAK_CVR_Mods/tree/main/ASTExtension/",
+  "changelog": "- Initial release",
+  "embedcolor": "#f61963"
+}
\ No newline at end of file
diff --git a/NAK_CVR_Mods.sln b/NAK_CVR_Mods.sln
index a01b4b8..3724659 100644
--- a/NAK_CVR_Mods.sln
+++ b/NAK_CVR_Mods.sln
@@ -77,6 +77,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "InteractionTest", "Interact
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "KeepVelocityOnExitFlight", "KeepVelocityOnExitFlight\KeepVelocityOnExitFlight.csproj", "{0BB3D187-BBBA-4C58-B246-102342BE5E8C}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ASTExtension", "ASTExtension\ASTExtension.csproj", "{6580AA87-6A95-438E-A5D3-70E583CCD77B}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -231,6 +233,10 @@ Global
 		{0BB3D187-BBBA-4C58-B246-102342BE5E8C}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{0BB3D187-BBBA-4C58-B246-102342BE5E8C}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{0BB3D187-BBBA-4C58-B246-102342BE5E8C}.Release|Any CPU.Build.0 = Release|Any CPU
+		{6580AA87-6A95-438E-A5D3-70E583CCD77B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{6580AA87-6A95-438E-A5D3-70E583CCD77B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{6580AA87-6A95-438E-A5D3-70E583CCD77B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{6580AA87-6A95-438E-A5D3-70E583CCD77B}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE