How about computer boards on the Back Walls of the Tactical Room, Maybes some viewscreens on there as well.
I like the piping suggestion, however you run the risk of it looking like Hoth, however I also like the grating suggestion that has been mentioned, if you make some of the floor look more metallic and add some see through mesh in there as well, which you can look down and see the lower levels, how do they get up the the higher levels (put a lift/elevator in), put some free standing walkways in it, leading maybes to a part thats free standing from the base.