Thanks everyone, and good eye for details.
Thecolclough: Yep, I didn't notice it until you pointed it out, but that one shot is clipped off on the right hand side because of the camera placement.
Ensoniq5: Aye, I realized about halfway through the render that I had forgotten to re-align the atmosphere object to make it visible to the camera.
Tanzim: Indeed, all the lighting in all these scenes, whether its the accent lighting on the Enterprise, or the lights in drydock are all spotlights. I've since created emissive maps for the ship and I'll get some renders of that up soon. The drydock, well, I tried to cheat by just putting four lights around the ship - above, below, to the left and right. It didn't look very good, so I took the full plunge - there are 96 lights on the drydock model so I placed 96 spotlights. It took a few hours to do that but in the end I think it was worth it.
The scene in ST:TMP with Enterprise in drydock is certainly what inspired the drydock scenes here. It's also the moment I got hooked by Star Trek. The music swelling as the ship came to life, that was just an awesome scene.
As has been pointed out, that was the refitted version of the Enterprise and of course this is the original series version of the ship, so I was envisioning this as taking place before she departed for her oringinal five-year mission or something like that.
One other discrepency in the drydock shots is the red stripe thing is missing along the starboard side of the secondary hull in 'drydock4'. I'm not sure why that didn't appear. It doesn't appear in the black background shots but at that point I hadn't created it yet. Seems to work now, though.