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Ok for now I am done. I put the foam over the frame and held it down with zip ties and bolts. I then fiberglassed over it and that's when disaster struck, for the left side anyway. The resin fumes got under the foil and ate away at the foam over a large area on the side. I cut it open and sprayed some Great Stuff and made it look as good as possible before taping it back down. I then taped the edges and painted everything. I plan on redoing it in 6-12 month with foam sandwiched between coroplast. The urethane foam is too stiff to work with without cutting and gluing it together so no more fiberglass...it was expensive anyway. I am thinking the corofoam sandwich should be very strong and stiff. I have only driven it 90 miles or so but it seems likes it is doing the job. It will take a while to tell how effective this iteration is.
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