Okay, here are a couple of pictures and some words about my drying box.
There are two chambers. The bottom is a simple box made from particle board. There is a slot in the end for air intake. In the top there are a series of one inch holes off to the side to let the hot air from the bottom into the top chamber. There are simple filters (those cloth filters meant to go in your hot air registers to control dust) covering the intake slot and the holes in the top (lid). There is a porcelin socket screwed to the bottom, with a 40 W incandescent bulb- appliance bulb (yes, those are still available). The lid only sits in place, resting on 3/4 x 3/4 wood strips glued to the sides, to enable changing bulb.
The top chamber is one of those plastic storage bins that we carry our models to shows in. It is mounted upside down. The top (at least, what is normally the top) has the center area cut out to allow air from the lower chamber to flow into it. It is mounted upside down with screws to the lid of the lower section. The remaining part, which makes up the top compartment, has two 1" holes in what would normally be the bottom (now the top). Again, one of those cloth filters acts to keep dust out of that chamber.
I installed a light dimmer in the side, but it is not needed with the 40W bulb- with the dimmer full on the box runs at just a little over 100 degrees. This is fine- I did not want it too hot, so it would not warp plastic. The dimmer can be replaced with a simple switch. That temperature works fine- dries to touch and about three hours, instead of several days. And, the filters ensure a dust free drying area.