Love the back, looks like it could go either as a gigantic heavy cruiser, or a freakishly fast corvette/cruiser/thing. I mean, that engine seems giant. You could fit a wing of Hercs in there, I bet. Though that'd be a pretty bad idea...for the pilots, at least.
Poor pilots.
Anyway! Yeah, I agree with what was said above. The superstructure, methinks, could stand to be cut down a bit, but bulked up on armor. I bet you could do the same with the radar, too; it doesn't make much design sense to have a really heavily armed ship with a completely exposed radar dish, after all.