Walk in humidor - anyone build one ?

[Girardian]

In many respects it's similar to building a wine room. I'd encourage you to use a vented wine room cooler and simply set the temp to a cigar-appropriate range.

I built a wine room, but the suggestions you get from the guys who have done it for cigars will be more on point.

One last note: there are companies that specialize in humidity control for wine rooms. These are large-scale active humidity systems, much like the large-scale coolers. I'm not sure how rock steady these are but it's worth researching. Not inexpensive, I'm sure, but if the room is large enough ....