Assuming the studs are 24"oc, close enough spacing for a coop, they are about 12x24 each. This fits the scale of the pier supports if they are standard premade cement piers with those slots each way as well as drop in spaces for posts. The posts fit the scale as 6x6s.
I think the stairs make it hard to see because most coops would have chicken scale instead of standard people size.
I think the stairs make it hard to see because most coops would have chicken scale instead of standard people size.