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fiberglass eats through the foam pretty much instantly.
cover the foam with a thick layer of latex paint or bondo.
alternately, cover the inside of the cardboard with ducttape (fiberglass won't stick to duct tape).
fill the inside of the holes against the cardboard with fiberglass. remove the fiberglass, and use bondo and a sander to smooth it all out.
that's how I built my whole car.
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