shortened passenger compartment. Chassis is now 3710mm long, still 700ish longer than roadster so you might be right with choosing different powerplant it might go against keeping everything simple and from as few different donor sources as possible. It might look a little bit more "right" when the bones and running gear are mocked on. Might be better to change donor completely to audi as suggested.
I might just bin playing with sketchup and get some steel laid out on the floor, its much easier to play in real life!
