you can use a T5 trans from the 79-93 mustangs and a bellhousing from Quad4Rods.com to mate it to the SVT engine. You'll need to make custom mounts, coolant lines, powersteering lines, relocate the steering rack, make a custom subframe/K-frame to clear the driveshaft, swap your front knuckles right and left to get the tie-rod tabs facing forward, etc. etc. etc.
It's basically identical to a v8 conversion, just without swapping the motor....just turning it sideways but the amount of fab work involved is exaclty the same. Check out DiscipleRocks's v8 build thread to get an idea what's involved.
If you could FIND a Kugel front steering kit and Kugel 8.8 rear end kit, you'd just need to fab a driveshaft, source the trans and Quad4Rods adaptor, and re-do all the lines/wiring to accomodate the motor being turned.
My majorly huge hand-made Focus RS replica build:
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My RS conversion is For Sale: http://www.focusfanatics.com/forum/vehicles-sale/578185-sale-rs-mk1-conversion-2003-focus-svt.html