As I said before the Banham is based on an Austin metro (Rover 100) chassis (literally cut the roof off at the top of the windscreen and the take all the bodywork off to the chassis at the back)
The dashboard and seats are from the Metro. So I am finding it hard to work out what the builder claims the donor car to be.
Unless anyone else can suggest a car the same size as a metro which would fit under the superbug bodyshell.
Otherwise no idea....