I found a retired camper fridge that should make a good shell for an incubator. But because it's not quite like anyone else's, I can't just follow an existing design. Thus I am wondering, what are the essential principles to follow? Is there a particular location (height, distance from eggs, etc) that the lightbulb should be? Is there a particular location the thermostat should be? And the fan? What else would be your advice to someone building an incubator, having looked at other peoples' design pages but having to adapt to a different container? Is there anything you're really glad you did, or wish you did differently? Thanks very much, Pat, wanting to get this built and running and stabilized in the next 10 days or so.