You my friend are creative..
Personally, if I was spending this kind of money.. id just go out and pick up a 2001-03 996 Turbo, Ive found several from dealers for 30-35k with 40k odd miles on them..
Then upgrade the turbos, reflash, strip the back seats.. etc.. and theres your rocket
That is just me, I understand the reason for creativity and attachment to cars and projects, just like Im going to put about 20k into my 10k boxster in the next year.
Good luck and keep us updated. for specifics on engine size and such I would contact Jake Raby or even Brad Roberts on this forum. They have a wealth of knowledge between them.