I have an idea for a cabinet that will allow you to control flow of humidified air to various levels of the humidor. I build custom cabinets too. Check out my site at
www.humidorminister.com. No cabinets but you might find the desktops interesting.
I can build just about anything though and do it specifically to your needs.
BTW, hows that new Patron on your Avatar? I've been meaning to try it.