I will also buy Panels for this as I have 2 Cars and could keep one to run/race next year .
Doors,Bonnets,Tailgates, glass etc..

These shells although heavily modified had to retain std Mounting positions for the suspension ,if you have a damaged Mk2 Focus RS you could get this rolling quite easily if you have some engineering skills .
The Fuel tank sits in the std place , the steering position is set back and needs some thinking about as does the pedal area but what a car you'd have once done !