I can remember when I outgrew my small steel safe. Back then I didn't have room for a bigger one in my bedroom closet.
If I had thought of this idea I would have done it. You could get one from Freecycle.org or Craigslist.com for free! Simple locking freezer refit would be an inexpensive solution to keeping your guns safely locked away from kids and hidden enough to keep a lot of smash and grab burglars away. It would be easy to add a dehumidifier too.
I like to attribute via links but this one came in via Pinterest!