My understanding (from almost financing a kit-car operation a few years ago) was that the 500 limit (it used to be 1000) was per manufacturer. Thus, an unlimited number of people could make a one-off like these. Fenders may not be required, but turn signals, lights, horn, mirrors, etc. - are. I might actually be able to use my HF English Wheel and pnuematic planisher for something after all !