Gun Rooms project

I did something similar in December. I have a 30ft by 6ft wide concrete cold storage in my basement. I framed in a wall with 2x2 box tubing 1/8" wall thickness. For now I'm using a steel exterior door with deadbolt. A vault door will be added when budget allows.

I have a gun storage wall on one side and a workbench for projects and reloading on the other. I also plan to build some shelves for ammo box storage
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I figured that fire/heat damage would be rare since the cold storage walls and ceiling are all concrete. I did insulate the exterior wall (behind my gun racking) just to help keep the room at a reasonable temperature. I have a space heater set to 60* and a dehumidifier holding 25% humidity.