12. The finished Back with the Ribs and Blocks. The Linings are added to broaden the gluing surface of the Ribs.
| Step 1 | Step 2 | Step 3 | Step 4 | Step 5 |
| Step 6 | Step 7 | Step 8 | Step 9 | Step 10 |
| Step 11 | Step 12 | Step 13 | Step 14 | Step 15 |
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12. The finished Back with the Ribs and Blocks. The Linings are added to broaden the gluing surface of the Ribs.
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