dero,
I can help you out with some of your questions.
#1 unless you have an unlimited budget you should not be thinking of R34 parts, just an example a R34 motor will cost around 5000$ more than a R33 and they are almost the same thing.
#2 I dont think there is a six speed RWD Skyline just the AWD. you can only get five speeed RWD transmissions.
#3 I am making some custom parts for this swap motor mounts, trany mounts, oil pans ,oil pickups, intakes, fuel sumps. So far i just have jigs for the motor mounts. And some parts for the oil pan and intake and exhaust are ready as well, most of the laser cut flanges that is. So i can also help with some of the parts. but i hope to have a line of RB swap parts to help people out.
#4 keep in mind that this project could cost you as much as 10000 just to get it running.
#5 you should do a search on RB in this forum