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Mine's built out of aluminum, using 1"x1/4" bar for the structure covered with .060" aluminum skin. The bars are held together with drilled and tapped screws and the skin is attached with either pop riviets or drilled and tapped screws. The Lexan window is attached by drilled and tapped screws.
The main problem with coroplast is that it gets brittle after a year or two in the sun unless you keep it protected under a layer of paint and paint doesn't stick to coroplast very well. The only places I use coroplast on my car are the belly pan where the sun doesn't reach it and for the side skirts which I keep painted.
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