Made by me, DannyX BL ID 18665
Based on the Shime Coal Mine(an abandoned mine) in real life, also nicknamed Anti-Zombie Fortress (according to know your meme)
Front View:

From other angles:

Rear View:

Another View:

Top Rear View(ignore other builds they aren't mine):

Top Front View:

There isn't much inside, only an teleport/elevator at the ground and first floor, and ladders from floor to floor

- Shows the ladder design and elevator/teleport room
At the bottom(ground) there is a vault door opened/closed by a VCE based keypad that uses a password
Comparison to real life:
