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Joe,
Two suggestions on your ribs.
Suggest you add vertical strips on the front and rear of the spar openings that are the same width as the cap strips. This will give much more gluing area and strength when assembled on to the spars. Also add one at the front where the leading edge attaches. These will not add much weight, but greatly improves the strength of your glue joints.
Second suggestion, is check around for a company with a CNC Router. High end wood working shops and cabinet builders may have one. You'll get perfect cut ribs with out the possible problems that a laser cut may have.
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