For the exterior, the really isn't any aftermarket at all. You can get the SVT kit or this other body kit that looks similar from Razzi. I don't know about any aftermarket hoods for the Contour. Every once in awhile people will start talking about having a carbon fiber hood made, but I don't think anything has ever happened. I could be wrong though.
As for the Zetec engine. If its a Contour with a 4cyl engine, then its a Zetec. Just make sure you get a 5spd if you are going to get the turbo. Have Terry beef up the transmission and throw the turbo on your car. Put on some sticky tires and don't worry about the looks of the car. After all, you are looking to shock everyone, right?