4 door rear pannels are totally different to 2 door GTR.. would be quite difficult to do IMO.
if u notice in the pics below. the rear doors are much different to ur stock ones. much more pushed out to meet the wider rear panels.
From memory only a very limited amount of 4 door GTRs were made or was this particular job a custom - anyone know? so finding doors already like this would be near impossible unless u got them made up as a custom job.
However, front panels and grill/bonnet should fit no probs.
DRFT_ceffy, awesome choice!! Go the ceffy's!! think i met u the other night at that mini MCCR meet, u in Syxti9's new car...