This has come up before. I do not recall the discussions.
For me, storing my firearms and magazines in Nevada is tantamount to not having them. Hence, this is of no interest to me.
I do not have firearms just for sport (recreation) and storing them so far away would just not be viable.
Those firearms I do have for sport, I ensure they're in a legal configuration. However limiting that may be, they are still functional and easily accessible.
It is my belief that most gun owners fit the description above, more or less.
Are there people with unregistered 50BMG's, unregistered "assault rifles", full auto "machine guns", "illegal" linked ammo and high capacity magazines, silencers, "ghost guns", and other forms of contraban? Surely, there are, somewhere. Is that your target market?
I'd bet it's a fairly small customer base.
I could be totally wrong.
Do you also plan having a place for them to shoot their toys, once they retrieve them?