I thought you were getting more birds so might expand the 'coop' area too.We have an enclosed.coop portion already which is the blue and yellow part. Before winter we always cover all hardware cloth with plastic sheeting. That way the chickens have a nice, snow free area. It also helps give them their wind free area.
We live in Northern Michigan, so nope!
You are gonna LOVE that big solid roofed run come winter!
Excellent Build!