For a fits-all kammback, I'd be inclined to try something easy to form, such as Coroplast with aluminum reinforcing across the grain for the bottom, sides and edges, and Plexiglas or hard-coated polycarbonate for the back light. Some wedge-section foam strips and wide vinyl tape might suffice for smoothing most transitions.
If I ever do the aero mods on my Metro, I'll be open to offers for duplicate fiberglass parts.
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There is no excuse for a land vehicle to weigh more than its average payload.
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