We made something like this for the shop, it is used to cure a urethane potting compound. We did it with one of those cheap utility closets with the particle board shelves. It is about 6 foot tall, 30 inch wide, 18" deep. We put a single panel with light bulbs mounted on the bottom. In the solid shelves we made a bunch of 2" holes on one end, and matching 2" holes on the opposite side of the cabinet beside the lamps. Repeat this up to the top, alternating the end with the holes, so the air flow zig zags. At the top of the cabinet there are three 5" muffin fans that pull air through the cabinet, heated by the lamps. It gets about 30 C inside, curing the urethane in about 2 hours. We have nine 60 watt bulbs, we unscrew some for less heat. we use it to dry alot of stuff.
If you made a smaller box an put a fan in it, and one bulb, it would probably work also. try different wattages till you get the temperature you need.
edit -- some embarassing spelling