How much BHP are you going to run?
Do you really need to run the T5? I have heard that they have quite high transmission losses.
If you are running less than 350 BHP surely you could get away with an MT75 box.
Much cheaper to buy than a T5 and easy to fit to a zetec.
Use the 2ltr flywheel and buy a modified release bearing from Westfield. See link below.
http://www.westfield-sportscars.co.u...earchCriteria=
I just scaled off their photo and turned up my own 19mm spacer to mod my release bearing.
This is the route i have gone with my 2.1 zetec turbo in my kit car.