Snubbie, that rack looks like a practical way to organize your guns for easy access, and your ammo shelf is a very attractive piece.
I was wondering about temptation and security. Is there a window in the room that makes it visible to a passerby or a neighbor from a vantage point at his home? How about guests or contractors?
A box frame with 1 x 6 sides and a plywood door with a hasp lock saying "paint locker" or some other innocuous label would deter a child or overly curious outsiders. You could even dress it up with a nice finish like your ammo shelf. I know it wouldn't be a bank vault, but there is value in out of sight out of mind.