A door based upon the vault doors found in Fallout games, but in GoldSrc. Unfinished currently; it doesn't have the mechanism that grabs onto the door, so the door moves by itself. It also can't be closed as of yet. The door consists of 2 identical func_train entities, one of which rotates while the other does not.
I once worked on something similar to this. If you ripped and scaled down some textures from Fallout (I've found texture packs for it before) you could make this look amazing.
https://www.youtube.com/watch?v=lMGoOiNA0C8&
The door is broken btw lol you need to fix it I can't remember how off hand ;( I had Hezus fix it for me. I just been playing Fallout a lot recently and saw this and I was inspired