I have been kicking around the idea of a gun vault/safe room. I found this site, Vault Doors, Gun Vaults, Armory Vault Doors and Hurricane Doors by Sportsman Steel Safe Company on the net that sells vault doors. The door and a 10' cube of 6" thick concrete will cost about $4,500. This is just a ball park figure I pulled out of the air. The door it's self was quoted at $2700. The door 4.5" thick and a frame up to 12" thick. Have any of you built a gun vault or safe room. I always try to get as much input as possible on any project. The idea of a vault door come from members of this site on an earlier post. Thanks guys.