white puffy thing was probably a high density foam. That is called "sandwich" composite. It can make a much lighter/stiffer carbon fiber or fiberglass part, and be cheaper too. (it is structurally like a steel i-beam) I've made a hood using CF/nomex honeycomb sandwich composite construction weighing 7.3 lbs, stiffer than anything you could imagine no homo. It was a pin on hood though, 4 hood pins, had to remove the whole hood to check the engine. you could lift it off with one hand though, so it wasn't a big deal for me. I'd definitely recommend reading more, and order some epoxy or resin, and fiberglass and start practicing. You will make many mistakes at first, but it is the only way to learn. start making molds of small things and working your way up. It is an expensive habit too, my hood mold cost about ~75-100$ to make, hood cost about $550 in materials.
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