GT4 body conversion...I don't know how much there is involved becuz I'm not sure what is all different (except for the hood of course). Other than that, you could prolly just buy all the metal from the stealership...or aftermarket will have it too I'm sure...but as I mentioned I don't know if that'd work, cuz I don't know how much is involved.
the price on the engine and everything seems alrite to me, I was looking into one and was told it'd be around $1500 CAD (~$1300USD). here's another topic where they were talking about the price
http://celispeed.com/forums/t6977-5t...eligt4gt2.html
or a couple stickies in the 5th gen forum
http://celispeed.com/forums/t6154-3s...-teardown.html
http://celispeed.com/forums/t5810-3s...p-writeup.html