I was wanting a gun locker for a long time. I was going to put it in my office also, kind of as a fun display. We are doing a metal theme through the house, so it was going to be metal framed with an expanded metal cage.
Ultimately I decided against it, because no one needs to see/know what I have.. and my office is not anywhere near the bedroom where I sleep.. and with the small kids, it seemed more of a risk than a benefit.
That being said, I still wish I had one. Can't wait to see what you do.