That looks like it would make a great conversion. replace the shelves with spanish cedar, line the cabinet with luan, (thin mahogany plywood, available inexpensively at Home Depot), maybe some weatherstrip seal for the door, you'll have a very nice humodor!
there are a few similiar projects detailed here, I'm sure you can dig up more info.
Dennis~
Good advice! Use 1/8" luan to line the top, bottom, door, and sides, and 1/4" luan to replace the back. Spanish cedar shelving is ideal, as it will impart some odor as well as absorbing some of the humidity to release as needed.
For humidification, I would recommend Avallo's Accumonitor system:
Accumonitor
Determine how many square feet you have to humidify, and get one extra cannister.
Don't worry about getting it completely airtight, just seal it up as best you can, as The Accumonitor will keep the humidity level very constant. I, personally, feel a bit of fresh air seeping in is not a bad thing, as most of the commercially and furniture grade humidors produced are not entirely airtight.
Most of all, enjoy your project, as there is a great deal of personal satisfaction in doing your own conversion!
My conversion:
Armoire conversion
It is, by no stretch of the imagination, airtight. But it maintains an RH of approximately 67 with minimal effort, and I have to refill the cannisters about every 1 1/2 to 2 months. And, most importantly, my wife loves the way it looks! :thumbs: Which may not be a consideration in your household, but counts big time at "Casa Straw"!
If you have any questions, feel free to PM me, and I will try and answer them as best I can.