diff --git a/build-vulcast-vertical.ps1 b/build-vulcast-vertical.ps1
index 917fe2c..defaf66 100644
--- a/build-vulcast-vertical.ps1
+++ b/build-vulcast-vertical.ps1
@@ -1,15 +1,10 @@
 #Requires -Version 7.2
-<#
-.SYNOPSIS
-    Builds the Vulcast Vertical OBS plugin DLL.
-    Builds OBS manually, then the plugin links against it.
-#>
 $ErrorActionPreference = 'Stop'
 $ProgressPreference = 'SilentlyContinue'
 
 $OBS_VERSION = '31.1.1'
 $DEPS_DATE = '2025-07-11'
-$WORK = "$env:TEMP\vulcast-build"
+$WORK = "$env:LOCALAPPDATA\vulcast-build"
 $SRC = "$WORK\vulcast-vertical"
 
 Write-Host "=== Vulcast Vertical Build Script ===" -ForegroundColor Cyan
@@ -79,6 +74,8 @@ if (-not (Test-Path "$SRC\CMakeLists.txt")) {
     Write-Host "  Downloading..." -ForegroundColor Yellow
     Invoke-WebRequest -Uri 'https://vulcast.xyz/dl/vulcast-vertical-source.zip' -OutFile "$WORK\source.zip"
     Expand-Archive -Path "$WORK\source.zip" -DestinationPath $WORK -Force
+} else {
+    Write-Host "  Source (cached)" -ForegroundColor DarkGray
 }
 
 # ---------- Step 2: OBS source ----------
@@ -88,22 +85,26 @@ if (-not (Test-Path "$OBS\CMakeLists.txt")) {
     Invoke-WebRequest -Uri "https://github.com/obsproject/obs-studio/archive/refs/tags/$OBS_VERSION.zip" -OutFile "$WORK\obs.zip"
     Expand-Archive -Path "$WORK\obs.zip" -DestinationPath $WORK -Force
     if (Test-Path "$WORK\obs-studio-$OBS_VERSION") { Rename-Item "$WORK\obs-studio-$OBS_VERSION" $OBS }
+} else {
+    Write-Host "  OBS source (cached)" -ForegroundColor DarkGray
 }
 
 # ---------- Step 3: Dependencies ----------
 Write-Host "[3/5] OBS pre-built dependencies" -ForegroundColor Cyan
 New-Item -ItemType Directory -Path $DEPS -Force | Out-Null
-if (-not (Test-Path "$DEPS\include\obs")) {
-    $depsUrl = "https://github.com/obsproject/obs-deps/releases/download/$DEPS_DATE/windows-deps-$DEPS_DATE-x64.zip"
+if (-not (Test-Path "$DEPS\include\obs\obs.h")) {
     Write-Host "  Downloading deps (~60MB)..." -ForegroundColor Yellow
-    Invoke-WebRequest -Uri $depsUrl -OutFile "$DEPS\deps.zip"
+    Invoke-WebRequest -Uri "https://github.com/obsproject/obs-deps/releases/download/$DEPS_DATE/windows-deps-$DEPS_DATE-x64.zip" -OutFile "$DEPS\deps.zip"
     Expand-Archive -Path "$DEPS\deps.zip" -DestinationPath $DEPS -Force
+} else {
+    Write-Host "  Deps (cached)" -ForegroundColor DarkGray
 }
-if (-not (Test-Path "$DEPS\lib\cmake\Qt6")) {
-    $qt6Url = "https://github.com/obsproject/obs-deps/releases/download/$DEPS_DATE/windows-deps-qt6-$DEPS_DATE-x64.zip"
+if (-not (Test-Path "$DEPS\lib\cmake\Qt6\Qt6Config.cmake")) {
     Write-Host "  Downloading Qt6 (~250MB)..." -ForegroundColor Yellow
-    Invoke-WebRequest -Uri $qt6Url -OutFile "$DEPS\qt6.zip"
+    Invoke-WebRequest -Uri "https://github.com/obsproject/obs-deps/releases/download/$DEPS_DATE/windows-deps-qt6-$DEPS_DATE-x64.zip" -OutFile "$DEPS\qt6.zip"
     Expand-Archive -Path "$DEPS\qt6.zip" -DestinationPath $DEPS -Force
+} else {
+    Write-Host "  Qt6 (cached)" -ForegroundColor DarkGray
 }
 
 # ---------- Step 4: Build OBS ----------
@@ -119,8 +120,6 @@ if (-not (Test-Path "$obsBuild\libobs\Release\obs.lib")) {
 
     cmake --build $obsBuild --config Debug --target obs-frontend-api -- /m /noLogo 2>&1 | Write-Host
     cmake --build $obsBuild --config Release --target obs-frontend-api -- /m /noLogo 2>&1 | Write-Host
-
-    # Install to deps dir so plugin can find it
     cmake --install $obsBuild --component Development --config Debug --prefix "$DEPS" 2>&1 | Write-Host
     cmake --install $obsBuild --component Development --config Release --prefix "$DEPS" 2>&1 | Write-Host
 } else {
@@ -131,19 +130,22 @@ if (-not (Test-Path "$obsBuild\libobs\Release\obs.lib")) {
 Write-Host "[5/5] Building Vulcast Vertical" -ForegroundColor Cyan
 Push-Location $SRC
 
-cmake -S . -B build `
-    -G "Visual Studio 17 2022" -A x64 `
-    -DBUILD_OUT_OF_TREE=On `
-    -DCMAKE_PREFIX_PATH="$DEPS" `
-    -DQT_VERSION=6 `
-    -DCMAKE_BUILD_TYPE=Release `
-    -DFETCHCONTENT_FULLY_DISCONNECTED=ON 2>&1 | Write-Host
-
+if (-not (Test-Path "build\CMakeCache.txt")) {
+    cmake -S . -B build `
+        -G "Visual Studio 17 2022" -A x64 `
+        -DBUILD_OUT_OF_TREE=On `
+        -DCMAKE_PREFIX_PATH="$DEPS" `
+        -DQT_VERSION=6 `
+        -DCMAKE_BUILD_TYPE=Release `
+        -DFETCHCONTENT_FULLY_DISCONNECTED=ON 2>&1 | Write-Host
+}
 cmake --build build --config Release -- /m /noLogo 2>&1 | Write-Host
 Pop-Location
 
 # ---------- Done ----------
-$dll = Get-ChildItem -Path "$SRC\build" -Recurse -Filter "vulcast-vertical.dll" -ErrorAction SilentlyContinue | Select-Object -First 1
+# The plugin builds as vertical-canvas.dll (from CMakeLists project name)
+$dll = Get-ChildItem -Path "$SRC\build" -Recurse -Filter "*.dll" -ErrorAction SilentlyContinue |
+    Where-Object { $_.Name -notmatch 'Qt6|obs-' } | Select-Object -First 1
 if ($dll) {
     $dest = "$env:USERPROFILE\Desktop\vulcast-vertical.dll"
     Copy-Item $dll.FullName $dest -Force