I have a green house about 30x40. It sets in an area where a lot of sun gets to it all day. I am thinking about making it into a hen house for the winter. It has electricity to it, and 2 exaust fans in the top for ventilation. I was thinking about putting plywood up 4 feet around the bottom in an effort to keep predators from getting in. (If they cant see them maybe they will leave them alone. A sliding front door for enterance, and a heater already in the building. What else will I need to do to it for winter. There are no drafts, and I am going to install the nest boxes, and roosts later this week probably. What do yall think?