The Model T front end would be OK. However, it's not that part that is giving me difficulty. It's the bodywork. The closest thing I know of that it is like is an egg chair, like this:

Replica-Arne-Jacobsen-Egg-Chair.jpg

That is pretty close to the shape I want, and I can draw that in 2D. Just turn this picture upside down and do some cutting.

I need to be able to produce a plan view. I'll play with it later today.

OME