if i were to have my run attached to my coop on the side where the door would be, could i get away with not having a door? the run has a roof so nothing could get in, that way they could always have access to the run and coop, just for those times when i'm away for a week or so, that way they could still go into the run, i was also considering just a bottom door, just some wood on the bottom half of the door, that way it's like a window, but they can't get out?