Racer, you've obviously a lot of work into this but based on personal experience, (I bought a '91 in '01 with 80k miles on it but pretty good shape) I paid about 1/2 of what your chart says and it was pretty much the going price at the time .. so that's a data point for you. I'm Canadian but it was a US car that I paid US dollars for.
I'm not sure if you're aware of it but there's a far amount of information on NSX prod'n numbers already. See:
http://nsxprime.com/wiki/Production_Numbers Note that there is some question about how Acura reported the numbers of sales .. calendar year vs prod'n year which might skew how that is applied to your research. Also, the NSX Wiki also includes a 'registry of sightings' (
http://nsxprime.com/wiki/Category:NSXRegistry) which used autotrader and ebay sightings most of which I had captured and later entered along with an archive of the for sale section of Prime. Some of that data may intersect with what you've captured but some may represent new data points. The Wiki has been locked down since Lud moved the site so no data has been entered since about 2014 I think but at that time, I think we had about 1/8 of the US prod'n numbers represented .. although not all may have pricing info.
Good luck with the effort. There aren't a lot who are prepared to go to that effort!
...Ian