The mould with corner and top and bottom blocks attached and the first rib bent and cramped to shape. The piece of wood to the left is the second rib before bending.

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The mould with corner and top and bottom blocks attached and the first rib bent and cramped to shape. The piece of wood to the left is the second rib before bending.

The mould with corner and top and bottom blocks attached and the first rib bent and cramped to shape. The piece of wood to the left is the second rib before bending.