I'm replacing a piece of my dash that will end up being a hinged cover (I hope) for my motorized screen. I'm guessing that fiberglass would be lighter and therefore more desirable because I want to use the smallest motor possible. If I used fiberglass, how would I go about making a duplicate piece? Would I tape it and put foil on it and apply fiberglass on top of that and that would be it (as I've seen in tutorials), or what? I've never used fiberglass before, so I don't know...
Here's what it looks like - it's fairly flat with two holes for the air vents: