i just re cored my gas tank hatch on my 91 v20... it was 30x32" iirc
i used kiln dried 3/4" fir plywood, exterior grade.
a fair bit of work to cut the core out, grind it smooth, bond ply with Peanutbutter paste, clamped, then three layers of csm over the ply (chamfered the edge with more PB. worked out fantastic! very stiff!
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