Yes I built my own, not at home at the moment so I will give you the size later but it is well insulated and the temperature is controlled by a reverse cycle inverter aircon 2500w probably cheaper to run than a couple of old fridges.
Size is 1,750mm x 1,700mm x 2,200 height got plenty of room for my fermenters plus the grain and all the other bits and pieces.
Usually keep at between 17 and 20 degrees C