Perry Mick wrote:

OK, I think I got it. Let me know if you see any problems. I will
replace the upper 1/8 x 1 x 1 aluminum extrusions with square steel
tubing with an endplate welded on and a hole drilled in the center for a
bolt.

Perry

Yep. That looks like it. Have your son make a 1/4 scale  balsa model to verify.

Paul Lamar
 
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