As other people have said, it's very difficult to do an Escort Cossie rep and make it look right. A lot of the kits make the front wheels sit wrongly (too far back) in the arches and because you're building on an Escort shell/chassis rather than the Escort which was built on a modified Sierra floorpan it'll be somewhat smaller. And the fibreglass always ends up cracking and looking crap anyway, and it's hard to get a good unrippled paint finish.
There are a few good ones about, but they've had a LOT of money spent on them to get them that way.

And you'll find if you tell your insurance it's got an Escort Cosworth bodykit on it (which you'll have to if you want your insurance to be valid) they probably won't even want to insure you at all.

As others have said, you might be better waiting a bit and getting a PROPER RS Turbo or something, you'll get the power and the fun then.