"If i'd like to get the long hicas thing out of the engine bay, I would need: -NA power steering resevoir (because the TT has a pipe that goes to the hicas?)"
No, the Z1 bypass fitting allows the removal of the Hicas actuator in the engine bay.
"What do you mean be "devain" the pump? I also don't get why we need another pump..."
I can't find the link since my bookmarks aren't working. But it involves taking apart the TT PS pump and removing a spring (or something like that).
1990 Nissan 300ZXTT Stage III+ 11.96 e.t. 1.61 60ft on original stock turbos