I guess it's bye-bye A/C, hello custom radiator and a lot of creative piping (= lots of lag).
I'd like to see how close that front turbo will get to the radiator

, and the heat from the rear one is gonna be roasting that firewall.
Good luck this is going to be a major PITA, which in the end probably won't gain anything over the tried and trued single turbo setup. The only gain I see is the "WOW" factor.