i'm in the planning stage of doing a similar project, at least i think i am. my plan is to install a metal door with a key punch combination dead bolt. the striker plate will be a 1/4" thick steel plate about 4 ft long that will be glued and screwed into the solid frame around the door. the deadbolt operates on batteries or a key if needed. not as secure as a vault, but should keep 98% of the criminals and hopefully my 9 yr old out of the room when we're not around.