I think you have been misinfomred.
N1 blocks are still unavailable in Japan. If you can get them...I will have ten please.
Also, the GT block is not 'taller' than the N1 block. How do I know? I've had 2 sitting beside each other. Interesting that you say there is a waiting list for the GT block. Maybe if they get another lot of 300, they will make another run.