Good thing is once you start pushing Sega Genesis clamshells, I feel pretty confident those things will practically sell themselves. And once word of mouth gets around, you'll have people from all over the place chasing after these. TCP, Nintendo Age, Digital Press, oh yeah...Sega Age, etc...
While these GB cases and the new UGC's your working on will most likely get the majority of their attention and interest from here, those Sega Clamshells are limitless. Just something to think about to give you a little reassurance when you take that next step...