I was contemplating making a silicone mold for a SBP "Sombrero" and trying to make a set of drivers out of resin. They would be solid and would have to figure out how to mount them, maybe thread-serts where the sheetmetal screws go. Paint then argent and run 'em?
And then some '65 taillight lenses out of tinted clear resin. Maybe a second hobby?