the 3 rails in the fuse are brass "square" tubing (K&S brand) not sure off hand what size thou. The 3 small pieces on the canopy is called "Plastisrtruct" it's a grey plactic I-beam material that will fit inside the brass square tubing, you take a dremel tool w/grinding disk and cut a slot wide enough for the I-beam to slide throu. Be patient, It's alot of tinkering and figuring out, trial & error type thing.[:@] also the sides were cut down I believe the thickness of the brass tubing.
Also take note the on the bottom of canopy has 1/64 ply glued to the inside to stiffen it, forgot to add that to the diagram below.
Hope this helps?
also study those pics in the other thread too!
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ACTUALLY!!! The Brass square tubing IS Brass "Rectangular" tubing
not square