[Moppie]

Doable but very difficult.

I beliece it reequires some tricky work to get the Turbo to fit, as the 3sgte sits lightly slanted, and so takes up a lot more width than the 4agze.
You would also need to do a lot of rewiring, as they both run differnt ECUs, with differnt genrations of OBD.

I think that unless you really keen on building a full race car, and had the time money and enginering skills, that it would be easier to simply buy a MK2, or stick with building the 4agze.