I have no plans on building one, but...... I've read a couple of threads about guys building DIY vaults by converting a closet. Usually the same basic design, a closet lined with 10ga or thicker steel, then double thick 5/8" sheetrock and finished out with a solid core steel firedoor locked with your favorite deadbolt(s). My question is has anyone built one before and if you have, where did you get the metal. To go down to the supply house and buy a sheet of 10ga is expensive, let alone enough to line a 5x5 closet. I did actually read one thread where the guy used chicken wire instead of the metal. I don't think that would work to well.