I guess I'm not a big fan of fiberglass on the metal frame. IIRC, fiberglass expands and shrinks at different rates and I'm guessing there could be some delamination issues. The other thing I see is the fiberglass sagging in-between the metal rails and showing through over time, and a painted surface could get scratched more easily. (If I were doing fiberglass I would switch to foam and shape it how I wanted it and then cover it. The foam can take any shape, can accommodate more radius curves that IMO would make it easier to cover, and provide more even support so it doesn’t sag.)
It looks like you have a lot of quality work and time into it and I would finish it up in metal. I agree and think that it would look great with sections of it polished metal and elsewhere with leather surfaces. With the skill you've shown so far I think it would be great to have that come through to where people can see it.
Another thing I was thinking of is to design it so the area around the cup holders has a metal surface for easier clean up.
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'85 F-41
'86 Camaro
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