[QUOTE]I dunno. 0.025" 2024 weighs about 0.36 pounds per square foot, just about the same as 1/8" plywood. The capstrips will add a bit of weight in comparison, of course. But scratch-building a plywood rib is easier than a metal one.
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I don't know Ron W. I followed the plans for the 701 to make my pattern and used a router to cut several at a time, cut the lighting holes with a fly cutter on my drill press then formed the ribs between two wood patterns then used dies to make the flanges. Seemed to go pretty quick at the time. Just seems easier than all those little pieces of wood. But there again, I've never built a wooden rib, so basically, I'm just babbling ! Lol. OK, I see now the ribs are cut from plywood. Sorry ! 
Bob
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