JDM RHD NSXs is a waste of time. The best place to buy a NSX in terms of condition, price, milege is the good ol US of A.
Did they make a Type S in 1992? The link to the NSX wiki says 1997+.
Actually, I believe the Type Zero was the closest to the Type R. It was basically the Type S with more weight reduction i.e. no HVAC, No audio, etc...
What is interesting is the redesign of the OEM intake on the Type S and Zero... I'll have to post a pic up...