finding 2 door mk5's or 6's is difficult now, 5 years ago there were plenty when I was buying mine but I sent 4 or more to the crusher and other people have done the same because they are not very nice cars so when they rust away there is no love to repair them, I had so many of them because I wanted to do what you are thinking of but gave up on the escorts and bought a Sierra and now a puma which are far better cars. Go with a mk4 Escort or early Fiesta.
If you do find one and need help collecting it then I might be able to help or if you would like to talk about creating the cosworth look then I will happily let you know my experiences