Space Station K-7 from "The Trouble with Tribbles" is obviously the source for these three models.
The 3D Model
Built using Hexagon 2, textured using Paintshop Pro 7, rendered in Poser 6.
The download is free. You can do anything you want with it, and I don't require any of those obnoxious credits to be plastered all over your beautiful renders. I used Poser 6 in the creation of the files. I have no idea if they will work in different versions.
If you download this and find that something doesn't work, you can send me an email and tell me what the problem is, and I'll do my best to fix it.