I was fooling about in the game Empyrion and decided to make up a few Morrow Installations.
The game engine has some nice items you can use in base building, but has a weird object placement system (only a single object inside a 2 metre cube, whether it is a wall, chair, plant or light etc)., so you can't always make things fit the way you would like, which is a shame...
Still it only took a short time:
I built it above ground so I could make over head shots, though I built a couple of bolt holes underground too.
I know its a bit blue, but i like that shade.
The project will probably have military grey or green, or some colour with "psychological" benefits, but for my own campaign, Morrow Industries corporate colour is blue with gold text.
23 images, on imgur.
https://imgur.com/a/huDLS
If anyone else has made 3d images, let's see them.
This was just a quick test to get a feel for a bolt hole.
Criticisms welcome !