Here is a link to pictures of an actual shelter, for reasons of security and privacy this is NOT my friends one, but they are all of the same basic design.

restored bunker

They all had the vertical shaft descending into the chemical closet room and tool store, portable generator stored on shelf above closet.
The main room contained shelving or racking behind the door, batteries on bottom shelf.
Fixed or folding table along most of the left hand wall with a cupboard near the end.
Two bunks across end wall.
The detailed internal fit out varied a bit, but the basic structure was identical.