Oh, and what IS that ball on the bottom? What's it supposed to be? Is it the engines or something?
According to the original concept art, the bottom is the civilian section of the SB, where the colony pods go and presumably where the trade ships dock. It also houses some sort of energy reactor. The top section, on the other hand, is the military part, where the commanders are and all the gunners and technicians.
And props to the weird swirly lights inside, they look tight... but wtf are they?
I think they might be nanobots doin their thang. just a theory tho.
What gets me is... When you look at the Vasari Phase Missile upgrades? They say they upgrade all star bases... Erm, how? I haven't seen my Orkulus firing any phase missiles. But it should, imo.
After the third weapons upgrade, the starbase gets phase missiles 
And i definitely think they need to do SOMETHING about the middle break. either get it to look like it does in the concept art, all shredded and stuff, or put some funky light tendrils in there or something like they have in the top hole thingy.