Nice work! I was just about to start building our first non-mobile chicken coop. I don't think we will have anything nearly that big for our first one, but who knows for the future. Same idea though, the space is fine when they are free-ranging, but if someone needs to watch them, it is best to have a run.
May I advise? When you build your coop. If you think you have it big enough make it bigger.
Ha! I was going to start on it today, so I will heed your advice. Although, we don't have any plans of getting as many chickens as you all have. 100 chickens is a lot!