My thought exactly. Right now I have an area upstairs that is basically an unfinished 3rd floor. Doors on rooms, etc. was thinking about making one into a gun room and putting in a steel cage door on the opposite side of the solid wood outermost door. Couple of different keyed dead bolts on the outer door.
Do it. You'll never regret it. If you are putting in a secure door/cage, then do gun racks around the walls. Keeps them separated, and easy access for maintenance and admiring. Use quality hard woods to boost the ambiance.
I'm not so sure I can agree on the smoke. Once bought an M1 carbine that either belonged to a smoker or the shop that sold it to me allowed smoking or both. The smell just soaked into the wood and the leather sling and took a while to get out again.
www.smithsecuritysafes.com 
Are you the guy who puts the capacity ratings on safes? They say 36 gun when you can really only get 8 in.
What size chest is that and where did you get the items to stack/pack them in the drawers??
They came from a company called STORLOC. They custom make the cabinets when ordered. I made the separators out of wood with felt glued on. Works well. Have different ones cut out for the different drawers. Shotguns take a bit more space.
