Hi, welcome to the forums.

I think there will be a market, as they will probably have the same
desirability as the first Skyline GTR, etc. I guess they will be a
classic car.
The R32GTR is the legend of those 3 generations. Being the fastest
4wd in the world on the dragstrip and winning 29 out of 29 races
on the racetrack (Group-A) and being the first GTR to lap 25sec
faster than a Porsche at Nurburgring. Could of lapped faster if it
didn't overheat. And I think finished 1st, 2nd at the Nurburgring
24 hour in 1991 and 2nd, 3rd the year before in 1990.
I think the R34 finished 5th in the Nurburgring 24 hour and from
what I have read, was using the same motor as used in the
R34 GT500 racecar in Japan. This engine was the RB28, as
used in Nissan's Lemans R33GTR.