Chrysler chassis?
So there you have it.
Built in Sweden I know not when but it has that Ford flathead engine, it sits on a 1939 Chrysler chassis and it has two 3-speed gearboxes, the second one turned backwards and working as an overdrive unit!
The front windscreen, as as has been ascertained, is from a 55/56 Ford and the rear window from a '56 Chevy. The side windows are sliding windows from a VW bus!
Apparently the builder created the bodyshape in plaster of paris, then made a concrete mould which he used to lay the fiberglass!
So I've added a point to woodinsight and we'll call this solved, but if I can find out any more I'll add it later.