Have often thought that a universal size hardtop supplied with self fit catches to match easy up fittings might be an option. The fibreglass moulding edges sufficiently oversize to allow trimming to suit individal car. It must be how MMC have worked in the recent past when the hardtop option was available. Self fit seals and maybe headlining could be part of the kit. MMC build tolerances can't be so diverse as to not make such a viable option.
