Since you have some fabrication savvy and want to take on the project, you might also look at the solution offered by forum member husam2012. He makes an adapter kit to fit twin turbos/manifolds from a GTR to the 370z. His website is
https://btwtuning.com but he has some great threads with pictures floating around this forum.
As far as fueling goes, going with suggestions from your tuner is generally a good idea. CJ-Motorsports is the big name in fueling for our cars, he is very active on this forum - userID phunk.
All the kits I have seen source oil by teeing off the oil pressure sensor on the front of the motor. Return oil is handled either by a custom oil pan, an oil pan spacer with return port(s), or by drilling and adding port(s) to the upper oil pan. Scavenge pump may also be necessary if the turbo isn't mounted high enough above the pan. BP is now using them fancy oilless turbos so this plumbing was unnecessary.
Smarter members will chime in for sure, but I look forward to following the project if you take it on!