Here is a proof box I built. It works pretty good, the only thing I may move the light (heat) on the top in the middle as now the bread is warmer in the back as in the front. The light is hooked up to a reostat so I can contol the temp. Also it has a 60 watt bulb. Winter will be the real test. And I may add some water for dampness. Sourdough starter on top shelf.