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I'd say the design is pretty good, but not the materials. What you have there is a pattern for something that will take the weather.
I took spacemanspif's word for it that you had used coroplast. Do you have any of that?
The rod looks about right for gauge/weight. With coroplast you could slip the rod through the flutes. If you V-notch the ends of the flutes along the curved edge the rod forming the edge could be let in and the edge wrapped with strapping tape or something. You could hollow out the coroplast enough to slip metal washers in between the skins.
If you left maybe four of the nuts and washers off, would it still stay attached?
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