Muz dont do it mate, keep the rs turbo for best and shows, then just build the xr3 up on a budget, if you break it when abusing it, it wont matter so much then as you know it'll be a cheap 2nd hand part source for replacement and you will know least you have a mint rs turbo to.

Ive been there with trying to do 2 cars at once and its a nightmare. I had a grey rs turbo which i wanted to make mint but also had a immaculate mk6 cabriolet which had been a smartly modded show car which i was trying to keep on top of condition wise.

Ive never had a car which i didnt care about the condition of and could just bolt on some 2nd hand bits without buftying them first then just thrashing it about not worrying about stone chips etc, it must be nice and so unstressful lol.