My husband and I are going to be building a coop for our flock very soon. We will have 7 Silkies (1 is a roo), 5 Easter Eggers, and 1 Australorp. We are trying to decide what materials would be best to build our coop. We are in southern Indiana and our winters can get into negative temperatures, while summers can be very hot (90-100) and humid. The Silkies aren't very cold hardy (they are wintering in our basement this year), and we had to keep fans on them all summer last year. I want to make sure they are able to stay out year round without any problems. I have attached a coop in the style we are considering.http://www.wabashvalleyenterprises.com/metal-chicken-coops?lightbox=dataItem-iwkkamos1 We would like opinions and recommendations, please.