I am not trying to rain on your parade, but it is going to cost a lot to do what you want.
Yes, you will need the GTR wiring harness, ECU, and Dash instruments.
Skyline digtal display, I am lost on that one.
AWD, probably not. That would be too much work.
There is one guy that has done the mod in a 240z(I think) he is sometimes on at
www.freshalloy.com