Yes! It's the Porsche 555 prototype (for VW) from 1953.
There were elements that were correct in what both Joao and Aaron65 said but I didn't want to lock it as I didn't think they were quite close enough. But Allemano has given me exactly what I was looking for!
It's not a well-known car, and it's not easy to find info on, although I'm sure it is well-documented.