Love your work!
I put the nismo oil seperator kit into my car today. Got rid of my catch can and ugly hoses.
No turbo, or intake or exhaust piping removal. Top stuff is easy. The bottom oil drain fitting I did in 2 hours. Jack up front of car, remove LHS chassis brace bolts, back off RHS ones, undo oil drain hose clamp, undo 2 12mm bolts on fitting, pull fitting off, put in new fitting, connecting up the 2 hoses now, then bolt in etc, check for leaks, drive off!
1/4 drive and 3/8 drives are your friend and uni drives!!!
The restrictor/bubble popper is also there to limit the amount of air drawn into the rear turbo intake pipe. As there is a decent vacuum there under boost conditions due to air filter, AFM etc. That was part of my excess oil in plumbing problem when I removed that section of piping with the restrictor, to put in the catch can setup.