I don't think it's the same car. I think two (or more) vehicles were built from a set of mail order plans, so it's two of the same (general) type of car. There are virtually no pieces that are the same on the two vehicles, other than the general shape. Fenders, doors, windscreen, etc. - are all different.
Plywagen, I think, is a mash-up of Plywood and Volkswagen