Well, I know it is probably way too early to post about this con.
Tekkoshocon V
Pittsburgh, Pennsylvania
It is 13-15 April 2007.
There is a modeling competition there. It has some pretty well defined rules and judging criteria.
It is a spring con, but for those that care, parking is free, and the hotel room rate is reasonable.
I know they had a Macross Panel with Matt Greenfield that was good. This year they would like to get some die-hard macross fans to run a panel
Tekkoshocon V Home Page
Edit:Corrected the year of the con