Well, as for just the parts from the X-type (did some day dreaming myself) I was able to come up with a qoute of 12,500 for the computer, 3.0L engine, drivetrain,steering and suspension. So basically this below. This is for salavaged parts mind you. Minus the exhaust.
Then think of all the fabricated parts!!! I had contacted Robert Mumm for any custom fabrication. The overall amount would be insane. Not to mention the fact that the car would still be relatively slow. Add the Haines/Hightower turbo and then you would have drivetrain work mostlikely also. So after you spend 25k on the setup, reconsider and just get an SVT Cobra, unless you really love your tour. Trust me, the coug would be there right now except I have no more than 3% of the money needed and no spare time.
GnuLoCo