I love the little bay in the back. In fact, if it isn't too much trouble, I would suggest bringing it up a bit so that it isn't recessed into the main hull. Besides being able to see it better, I think if you wanted to script anything flying into or out of it, it would be less likely to get snagged. It reminds me of the little single helicopter bay on the back of some navy destroyers. You could even do a little spaceship helipad on the texture there with landing lights, were you so inclined.
Directly forward of the top turret, maybe add some sort of heat spreader looking thing that makes that BBlue look like it has more bulk to it than the two MBlues? The old Bellerphon model always bothered me with that. It was so symmetrical with the beams, but that center beam was so much more powerful. I noticed that you already beefed up its beam emitter.