I have currently remodeled a 2 level wooden playhouse into a into a coop. The top level is completely enclosed with a roost, 2 windows that can be opened and closed, wood floor, nest boxes, and a small hole for a ramp to connect the levels. The bottom is enclosed with chicken wire and is a dirt floor. It is 30 sqft. Would the 30 sqft on the bottom be a big enough run for three bantams, or would I need more because I have space to build on a larger run. And if so how big should it be? I know there's no exact number for all this, but I'd like some different opinions.