Some years back I made a food dryer for drying apple, pear and other fruit slices. I don't remember where I got the plans for it so I will try to give you what I can recall about it. I believe it would also work for drying blanks.
It was basically a cube shape about 18". The top, (roof), had a two by sixteen inch opening in it to let the moisture and excess heat out. The front of it consisted of a base plate tall enough to block the heating element, (more on that later), and the door. There was also a 1/2" gap between the bottom of the door and the base plate to allow air to enter the drying chamber. The shelves were just like screen frames with aluminum screen material to let the heat come up thru the different layers of shelves. Dimensions of the shelves were to fit the inside of cube with clearance for ease of removal. Shelf guides/rests were simple strips mounted to side of cube.
The heating element consisted of four simple porcelain light fixtures of the type commonly used in basements, and used 60 Watt bulbs. As a note, I only used two at a time and it seemed to work great for drying fruit. The fixtures were wired in parallel, Hot/black wire to Hot/black wire, etc. so that if one bulb burned out the others would stay on. I left mine on for days at a time without problems.
Hope this is of help to you.