Well, MANY years ago, when I was doing my orthodontic residency in Chapel Hill (late 80's) we had a local NACRA dealer who attended and there was even a Supercat dealer there! He had a Supercat version of the 18 square on display (but it didn't quite fit the 18 square rule ). Never have seen or heard of this boat since- Maybe it was the only one they built?
Lots of fishing/ski boats and some monos and the Central Carolina Sailing Club, our NACRA/open Fleet, Isotopes and Hobie Fleets all had booths.
The show to go to when I lived there was the Annapolis Show - Lots more boats and easy drive- Usually a bunch of us went up together.

Kirt