Bevins had a plan several years ago that was state of the art but I didn't want to work that hard. I found some scrap plywood and made a box- Cost$0. The "Door" is screwed in and has to be unscrewed everytime you "Open the door"- big deal- takes about a minute. There is a wood dowel protruding through the top part of the box from which wet towels are hung like a towel rack. I put a pie tin under the towel in case it drips. I put an oridinary lamp in the bottom of the box to heat things up and create some humidity. There is also a removable shelf within the box with some 1 x 2 cleats upon which it rests. The shelf is for small parts, the barrel, rib, etc leaning against the wall in the back of the box. Now there are some cracks in the seams of this box so I put a leaf bag over it(like a coat) to really hold in the humidity. Didn't cost me a dime, took about an hour to build. Works great. If I was a professional I would build the box with a hinged door, etc but what I have is fine for one or two guns a year.