Hi Daniel. Ive made this model as well.
Don´t worry or get hung about details here. Paint the shells, with brass, highlight the top with gold and silver mixed, and add a heavy black pin wash around them. paint the chairs and little detail around the crew hatches. Add a few bits of figure storage for colour. A little chipping and sratches on the sides will also be noticeable .. if you care to add them.
When the turret is in place, not much of this will be seen. Your really are only going for an impression of what was there ... cause unless you use an interior lighting system ... the most wont be seen. What you have done so far is excellent, and will be perfect when she is closed up.
If you want to add a bit extra .. do so in the turret area, because much more of this is visible. Also "go to town" with added stowage on the outside ... this is what really adds to this kit. Verlinden have a set to dress this up, but its mostly stowage to add after building.
Good luck with the rest!