I want to build a coop that is indoors in a walled off alcove of my downstairs living area for four bantam chickens. The coop would be designed right into the 4' x 3' x 8' area and would incorporate an existing window that I would use as the door to the outside. The alcove area is 4' x 8' x 8'. There is no door in the alcove at this time but one could be added. The chickens would not be living in the house at all, just using the indoor space. There is no outdoor space available that would conform to city ordinances. I plan to let the chickens free range all day and just use the coop at night. Is this practical and healthy?