The great news is that they're available everyday for 50k, so buy for 50k, spend 10k on motor, another 5k on induction, 3k on a clutch, 2500 more on ECU, 3k on suspension, then replace parts as they wear out. Skyline GTR fun and laptimes to match without having to wonder if any Nissan reps are taking down licence plates in the pits to go home and report to the boss so they can void warranties.
Although, if you enjoy being held to ransom, paying crazy prices for parts, and still ending up with higher laptimes than a well sorted previous model GTR - then good for you
BTW - I look forward to buying a JDM GTR in the future for race only