diff --git a/.github/workflows/tmp-sigma-esp-yoima7.yml b/.github/workflows/tmp-sigma-esp-yoima7.yml
new file mode 100644
index 0000000..affa845
--- /dev/null
+++ b/.github/workflows/tmp-sigma-esp-yoima7.yml
@@ -0,0 +1,67 @@
+name: Temporary Sigma ESP yoima.7 build
+
+on:
+  pull_request:
+    branches: [ master ]
+  push:
+    branches: [ tmp-sigma-esp-yoima7-20260807 ]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  actions: read
+
+jobs:
+  build:
+    runs-on: macos-14
+    steps:
+      - name: Checkout helper branch
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: microsoft
+          java-version: '21'
+
+      - name: Download yoima.6 source artifact
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          gh api repos/${{ github.repository }}/actions/artifacts/8981866543/zip > previous.zip
+          mkdir previous
+          unzip -q previous.zip -d previous
+          SRC=$(find previous -maxdepth 1 -name '*yoima.6-source.zip' | head -1)
+          test -n "$SRC"
+          mkdir source-unpacked
+          unzip -q "$SRC" -d source-unpacked
+          PROJECT=$(find source-unpacked -maxdepth 1 -type d -name 'SigmaRemake*' | head -1)
+          test -n "$PROJECT"
+          echo "PROJECT=$PROJECT" >> "$GITHUB_ENV"
+
+      - name: Apply yoima.7 stencil overlay
+        run: |
+          base64 -D -i tmp-sigma-build/yoima7-overlay.tar.gz.b64 -o yoima7-overlay.tar.gz
+          tar -xzf yoima7-overlay.tar.gz -C "$PROJECT"
+
+      - name: Build Fabric mod
+        working-directory: ${{ env.PROJECT }}
+        run: |
+          chmod +x gradlew
+          ./gradlew build --stacktrace
+
+      - name: Package modified source
+        run: |
+          cp -R "$PROJECT" SigmaRemake-yoima7-source
+          rm -rf SigmaRemake-yoima7-source/build SigmaRemake-yoima7-source/.gradle
+          ditto -c -k --sequesterRsrc --keepParent SigmaRemake-yoima7-source SigmaRemake-Fabric-1.16.5-1.0.5-yoima.7-source.zip
+
+      - name: Upload build
+        uses: actions/upload-artifact@v4
+        with:
+          name: SigmaRemake-Fabric-1.16.5-1.0.5-yoima.7
+          path: |
+            ${{ env.PROJECT }}/build/libs/*.jar
+            SigmaRemake-Fabric-1.16.5-1.0.5-yoima.7-source.zip
+          if-no-files-found: error
+          retention-days: 1
diff --git a/tmp-sigma-build/yoima7-overlay.tar.gz.b64 b/tmp-sigma-build/yoima7-overlay.tar.gz.b64
new file mode 100644
index 0000000..67fe24d
--- /dev/null
+++ b/tmp-sigma-build/yoima7-overlay.tar.gz.b64
@@ -0,0 +1 @@
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goiuZrExN1VVgul9F9V1Ypfz992TJiSE/E7ATcy8HuWdZPb/prOEyEodAYvHV6ulbB6sFFFBAAQUUUEABBRRQQAEFFFBAAQUUUEABBRRQQAEFFFBAAQUUUEABBRRQQAr+C/9ISU8AeAAA==
\ No newline at end of file