you would actually make the plug (actual shape) and then pull molds from that. the problem is making it fit the ffr chassis particulars without real world physical fittment. this would also involve having or creating the cad files for the chassis. working everything out on cad files and it actually working together (chassis/body) would be difficult and expensive. even ffr has done the body the old fashioned way, by taking the chassis and manually building the body to fit. at this time it's still the easier way to do it.