alright. Just a heads up... get ready for some serious "ownage" type remarks.
That said, skip the 2.0fsi from the TT. Forget it. Yes, anything is "possible", but you don't want that engine anyway.
Are you absolutely positive on making your P5 the "huge car project"? Take a loooooooooooong time to think about that question, and if the answer is still yes, then ok.
To conclude, a "s*** ton of money" is a subjective term. Explain further. If you just hit the mega jackpot millions, and you still want to make the P5 your huge car project, pay someone to put a 20B rotary engine in there. You'll certainly have the best P5 ever, bar none.
..... well that was fun