I built mine using one of those medical styrofoam chests that 2inches thick.. its about 14 inches wide and 17 inches long i cut out part of the top and put plexiglass on outside and inside and sealed with silicone and metal tape. i put a computer fan at one end close to the top and drillled 5 small hole behind the fan to pull in fresh air i put a light socket on the side down from the fan them wired in a wafer themostate past the light the fan blows all the time and it blows the heat from the 40 watt light buld toward the wafer i drill a 3/4 inch hole on the other side for ventilation. i put a cookie sheet in the bottom with a small sponge and drilled a 1/2 inch hole in the end and put piece of pvc pipe in to add water without having to open it..i put 1/4 inch hardware cloth on the bottom over the water pan. i have hatched 4 batches of quail eggs so far and it holds perfect temp and humidity.. hope this helps ..