My husband and I are about to build our first coop. We are chicken newbies and will have 5 hens. We live in Kenutcky so warmer summers and colder winters. Every where I read says 4x6 coop would be big enough for 5 birds. I just want to make sure this will be ok for the winter. They will have access to at least 5x10 run, hoping to make this bigger.