
The first thing to do is to cut a rectangle of thick matboard for the base/bottom part.
Haint's rectangle is 12" x 24.25"

So he cuts out long strips that are 1.5 inches wide.
These are for the inner and outer walls.

Haint lays out 1" x 1.5" ribs to make 1 inch between the inner and outer walls.

A papercutter makes the production of a lot of ribs fast and easy.
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