Have you checked this post out?
Chrisportif has used the ns7 platter on his 5000m with 12inchskin custom disc and spindle which are currently available.
I used to trade in DJ turntables years back and believe it or not most used same parts. I don’t see any difference when studying pictures for motor placements used in ns7, ii, iii, sc5, sc6, R one & 12.
The blueprints have the same, close or similar layout. However I can’t confirm nor deny too and if the spindle thickness is smaller on past units then that could be an issue to fit to current models.