I am making a new coop for my ducks and i wanted to know if a coop that was 3ft tall 4ft wide and 8ft long was big enough for 9 ducks? Also it is only for night time and they have a big pen for the day time. Another thing is should i use the deep littler method for ducks? or is it not a good Idea? what else should i do for the bedding or ground?