good deal!
My only fear is the snap ring but I guess thats the risk taken when buying a 91-92 nsx.
Check the actual transmission number to see if it actually falls into the snap-ring 'range... either it is or it isn't!
In regards to required maint'/service that was deferred, ballpark figures would be $750-$1250 for the
4yr/60k (ie. coolant/ABS/brake fluid-flush, replacement of oil/fuel/transmission/air filters & fluid, new spark-plugs & coolant-hoses, valve-adjustments, etc') & $1250-$1750 for the
6yr/90k (ie. timing-belt & water-pump replacement, etc').
The price-ranges given above are based on acquiring discounted OEM replacement-parts yourself & going w/ an independent srrvice-shop (low-end) vs. getting a 10%-20% discount for OEM replacement-parts from an Acura dealership parts-dept & letting their service-center perform the job (high-end).
Familiarize yourself w/ the '
search' function and
FAQ/Wiki', you'll come across invaluable info'/insights as to what to look for when acquiring a pre-owned NSX.
Also, consider a getting a Pre-Purchase Inspection by a local-area Acura dealer service-center who has experience w/ servicing a NSX. You can then become aware of any wear-&-tear items that may need attention, and also if there ever as an accident/collision or paint-work.
G/luck!