I like it, but I don't know about canvas at the material. It seems like it will be really hard to get it tight enough so that it doesn't flap around. I think the easiest/cheapest/hack job lookingest way would be with a sheet of plywood. Or if you build a good frame for the canvas idea, but instead of canvas use woven fiberglass (often used for boat building) stretch it, then paint on epoxy. This will give you a hard shell that is light and stiff. I'd estimate you could do this for about $100 + the frame + a lot of time.
For boat building people don't really uses the fiberglass by it's self, it is rapped around wood before the epoxy is added, so I don't know how well this would work, but if well stretched it seems like it could. I've always wanted to make some body panels for my car in the same way as a wood strip canoe. About 1/8" thick, by 1 1/2" strips of wood laid together and bent into form, then fiberglass coated. It looks really beautiful, plus it's light and strong.
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