I've thought about this a lot more. Trying to determine how bad each of the weaknesses really are.
Adding weight kind of sucks, especially without a lot of tire to back it up.
It actually looks like some crazies have fitted 275 A6's but I don't plan to ever move up to that aggressive of a compound. It would be nice though to be able to find a 275 width 15" Nt-01 though, which is the tire I plan to run on the streets. Looks like the widest 15" they have is 225... that't not a lot of tire for a 2500lb car.
EDIT: I'm also going to keep running this by car people that I meet. Seeing what the reaction is to the miata platform.
More than what other people think, I ask myself, is this car really me? And the clear answer is no it's a little soft around the edges, which I'm not, but if I'm lucky maybe I can toughen it up a bit. I think the roll bar, the right stance/ride height, and some minor tweaks and it could be a bad little roadster which is really my end goal.