AccurateShooter have written about the Zanotti Take-Down Safe. I think it is a great concept. I may get one myself!
Zanotti Armor offers safes that are ideal for gun owners who need to move frequently or who live in a location where it is difficult, if not impossible, to position a conventional safe. Zanotti safes arrive in three or four discrete shipping boxes. The safe is assembled by the owner, on site, in six steps.
The heaviest component is the door, weighing 110 pounds in the 16-gun ZAI safe, and 175 pounds in the largest 52-gun ZAIII model. Five safe models are offered, ranging from 350 to 925 pounds assembled weight, without interior. Zanotti safes are very popular with police, military personnel, and others whose jobs force them to re-locate often.
The safe can be assembled in under 30 minutes with no tools other than a hammer, and all you need is a hand dolly to move any component.