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Another thought about construction: I did a "safe closet" in a building for the Forest Service a couple yrs ago. The walls were 8" CMU w/ a horizontal bond beam every 24", vertical reinforcement every cell and fully grouted. The ceiling was a pc of 3/8" or 1/2" steel plate attached w/ anchors embedded into the top of the cmu wall. This is a much easier and cheaper way of building a "bomb proof" room in lieu of cast in place concrete. If feel you need additional fire protection beyond that, you can always laminate a few layers of Type "X" sheetrock on the inside.