Here are some links for you:
http://www.cigargroup.com/gallery/homemade.htm
http://www.cigargroup.com/faq/
Old refriderators have been used by many. The drying out you refer to is caused when the fride is running. Fridgidors should not be in operation while storing cigars.
The main points to using any item for storing cigars is that you want a "container" that seals well (so it can hold a constant humidity), you want to add spanish cedar to absorb excess moisture (and release it in low humidity situations), and you want to add a humidifcation system. The best passive humidification system is simply an open container (perhaps a travel soap dish with holes drilled into it), and wet Oasis florist foam (not the dry stuff!). Add a 50/50 mix of propylene glycol and distilled water.
Good luck to you!
-Huminie