diff --git a/.github/workflows/deploy2.yml b/.github/workflows/deploy2.yml
new file mode 100644
index 0000000..bc252ac
--- /dev/null
+++ b/.github/workflows/deploy2.yml
@@ -0,0 +1,79 @@
+name: MyST GitHub Pages Deploy
+
+on:
+  push:
+    branches: [main]
+
+env:
+  REPO: PySim
+  BOOK_DIR: book
+  BASE_URL: /PySim
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: 'pages'
+  cancel-in-progress: false
+
+jobs:
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v3
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 18.x
+
+      - name: Install MyST Markdown
+        run: npm install -g mystmd
+
+      # Build MAIN site (myst.yml lives in book/)
+      - name: Build MAIN HTML
+        shell: bash
+        run: |
+          set -euo pipefail
+          cd "${BOOK_DIR}"
+          myst build --execute --html
+
+      # Build JB2 site and copy into MAIN output under /JB2
+      - name: Build JB2 HTML into /PySim/JB2
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          git fetch --all --prune
+          git worktree add ../_JB2_build JB2
+
+          # Build inside JB2 worktree, from book/
+          pushd ../_JB2_build/${BOOK_DIR}
+          BASE_URL=/${REPO}/JB2 myst build --execute --html
+          popd
+
+          # Copy JB2 output into MAIN output folder
+          rm -rf ${BOOK_DIR}/_build/html/JB2
+          mkdir -p ${BOOK_DIR}/_build/html/JB2
+          cp -a ../_JB2_build/${BOOK_DIR}/_build/html/. ${BOOK_DIR}/_build/html/JB2/
+
+          git worktree remove ../_JB2_build --force
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: './book/_build/html'
+
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4