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Next, the gluing edges of the two halves of the back plate are blackened with a black permanent marker pen, allowing me to see the accuracy of glue joint surface during the following steps in fitting the joint.

Now I am sanding the bottom surface to make it flat. This bottom surface, where the glue joint to ribs will be, becomes a finished surface.

...showing the progress on the first half being worked on.

The process continues until the black is just all removed from the wood surface. Now the other side is to be started on...