Original FF/CMC molds/jigs came directly from IM (early) in Calif around 1987/8 so only real difference was IMs were built in controlled shop while CMCs were sold mainly as DIY. They even (reportedly) shared the cast hibachi grill. CMC did add the flared California model. CMC differ in that the bodies were colored gel coated (so didn't require costly prep for painting). The interior was DIY foam/vinyl too. The tops and tonneau was also vinyl. So adding quality paint easily $2-3k, nice interior $2-3k, and top another $1k.