What would be a good panic room ?

I'm thinking of having one built and the guys are pros at this and they are ready for my go . So the bookcases and fireplaces are way way too simple and anyone would know . but all combined would be nice right . The one I have in mind is what I saw at their website . They made this 3 inch thick steel behind the fireplace . and the chess board is the key , you have to put special pawns at special places to open .So how about a small room . Just put a fireplace a big one and then the room is 5 time the size . Because I want to put about 10000 $ , a glock with 15 magazines and maybe a silencer . A few of my most valued items and basically my life . And of course medical kits and various painkillers . So any improvements you would suggest