I used coroplast in the center and aluminum panels at the front and back. I think that might be more rugged. I also used a lot of the automotive grade plastic "pop" fastners, which cannot rust. I'm thinking of removing the few bolts I used and coating them with anti-seeze grease.
The aluminum cannot be shaped into complex shapes, and that is a slight negative, but this can be compensated by using multiple panels. Not as smooth as 3-wheeler, but looking at production panels like the Audi A8, I think it is probably adequate.
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