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One of the big problems with fiberglass is, absent female mold, it's hard to control the surface finish.
My parents did a lot with fiberglass, they lined an entire [tiny] bathroom with it once. What they would do is squeegee resin out under Mylar plastic and then peel that off after it set. You could mix in micro-beads for filler. Knock down the high spots first.
Also consider a backlight from a boat-tail Riviera. Or early Barracuda.
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