Anyone ever considered it, for guitars, rather than cigars?
The master bedroom in my place has a pretty good sized closet, or a small-ish walk-in, depending on how you look at it. It's certainly big enough to hang the majority of my guitars up. It's maybe ~6x4. I'm thinking that with a little cedar, some bits from this place:
And some DIY, I could turn it into a humidity controlled guitar storage space, kind of like the big rooms they have at music stores for acoustics.