For my VH engine I'll have to fabricate a drysump pan, since I plan to use a drysump oil system.
I've seen the front differential on the GTR shatter into peices so I've planned ahead and will use a rear differential in the front for the longer axle I plan on having an intermediate shaft rigged up, it'll take much thought but it will work out for me.
The GTR needs its TPS sensor the system wont work right without it, I've asked around on several skyline forums and did alot of reading to find the yes and no's you can do with the system.
You should use the GTR's ETS ATTESSA ecu if you plan on doing any high performance activities as it is programmed for it.
If you have the money you could go ahead and get the bee*r adjustible ETS controller it comes with its own ECU which replaces the orig GTR's ETS box. I plan on getting this unit.
http://www.otomoto.com.au/beer.htm
There's my plan.