A couple of examples of Escort Cosworth replicas currently available. Hmmm, nice.

http://cgi.ebay.co.uk/Escort-Coswort...1%7C240%3A1318

http://cgi.ebay.co.uk/escort-coswort...1%7C240%3A1318

If you really must do it, to make it stand any chance of looking right you need an early H-K and possibly L registerered Mk5 3 door Escort, because the Escort Cossie was based on the look of the early Mk5 rather than the facelifts. As you can see it's very easy to make something kak so the more you spend the better it will be.