Ben, thanks for the vid but it wasn't a great deal of use except for his cutting advice. In regards to roof chops, all he does is say he has done some.
Colin, that is a great looking RS2000 indeed, will have to keep an eye out for a 1/24 kit of one (if it exists).
Gavin, the body kit is made mostly of plasticard with some bits of sprue so is scratch built.
Next things on the list are to radically re-design both the front and back ends. If anyone has any cool ideas I'd be interested.
That's the beauty of doing a modified car, I can do anything to it I want!