This is a good looking small coop design. With the dimensions mentioned in the article it would house 3-4 birds (about 37 sq feet incl. space under the coop). I would have liked to see more photos of the construction process, however. Perhaps in a future update?
From your run dimensions, you have enough space for maybe 2 chickens... minimum of about 10sf per bird. There doesn't seem to be any fencing in your neighborhood... so do you ever let them out to free range?
