How many turkeys are you getting is one question. For our turkeys here they don't use a house period except to lay in, they roost outside in all weather. The only time we force them to go in the house is during hurricaines and tropical storms - and I'm here to tell you they don't like it. lol Last year we built a range roost and that seems to work well, (I'll get pics this weekend) Basiclly it's a just a roof over roosts and I put 4 nest boxes in the back.
Hopefully somebody in a colder climate will chime in.
Steve in NC