Fiberglass would be a piece of cake. So would carbon fiber. Here's a forum that covers all that and is owned by a company that sells everything you need. Doing it with these materials it might be easier to make your mold from wood or even cardboard.
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'68 Short Step
LS1/T56, Hydratech, Fatman Fabrications Stage III, Baer, Hot Rods to Hell, US Body, S&W, etc
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