Look forward to seeing it all come together... don't put the bigger brakes on before getting the bigger wheels!! lol
For Fiat coupe conversion (305mm Alfa GTV discs) 16" wheels will do for 330mm (GTA) discs you need the TH 17's. I recommend straight induction to the turbo. Something you can probably fabricate for a few quid! :) faster spool up...
You could always go with the F40 calipers if anyone has a set lying around! LoL