A few months ago my frizzle went broody and hatched 5 eggs, but another hen had snuck into her nest and laid another egg. When the 5 hatched, she abandoned the last egg and so I put it under one of those metal lamps for the few remaining days and it did hatch. So my question is, if I have an insulated box without a lid but with a lamp and a pan of water, could I feasibly hope to hatch eggs in that manner if I monitered the temperature and humidity?