Well, I looked at the trans parts for my HPI built 6-speed Nissan S15 trans, going into my Cressida.
Damn thing has been on my bench, apart, for over a year now.
So much work done to it already, and still not together...
Actually, I did do work on a new, better retainer for the 4th counter gear, a known weak point in these transmissions.
Still have to bore it to 33.5mm, then split it.
Also change the type of snap-ring that retains it, went from a standard snap-ring, to a spiral ring.
Used a thrust bearing race to make it from.
Had to thin it by .005", cut the OD down, and then grind in the snap ring grove.
Was thinking about leaving the ID at 30mm, but after thinking about it, decided that cutting on the counter shaft may not be wise.
Have you posted about your Cressida?
Those were awesome, and underrated, cars, akin to a Supra sedan. Very stealthy.