My 496 airbox was made from polystyrene glued sheets and carved to fit the frame. Skimcoat of plaster. Fibreglassed over that with epoxy resin as more fuel resistance. Mat gave an OK finish with minimal bog. Cut a hole in the top and dissolved the styrene with thinners/ picking away at it. The plaster took a little while to pick away/ clean out but it was all a lot more lazy than doing it the proper way.
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