Reminds me of ship ribbing. What did you use for your bending members? Is it a plywood/laminate material or did you bend lumber? I like your design!
I've been trying to figure out what would work in terms of lumber for a
greenhouse. I'm comfortable working with
wood, but I didn't want to use 2x4's, it just seemed like overkill.
I imagine if someone took maybe 4 sheets of 1/2 or 5/8 plywood, and laminated them together (two sheets thick, with staggered joints, resulting in one 4'x16'x1 1/4" panel), you could probably cut curved
greenhouse support members from that. I suppose you would need to seal them so they wouldn't respond to the high moisture environment of a
greenhouse, but I think as long as they were cut 2'' thick they would have enough rigidity.
Just an idea. Probably not as cost effective as using that same plywood to build a bending jig to form galvanized electric conduit, unless it's lying around....