Innermost rib.
The innermost rib of each wing is a bit different. It is 3/8 inch thick instead of 1/4 inch like all the others. So, Joe noticed this on the drawing, and made a note to purchase some aircraft grade plywood in 3/8 inch thickness. BTW, it is rather expensive. It must not have any holes or knots, and must be "certified". So, Joe will buy some, or if you have some you would like to donate, let us know!
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