I am getting started with chickens and need help with my coop. Thinking of building a coop about 4'x2.5' and try to keep it lite for moving. we are going to have 3 to 4 large chickens, (java, dominque, or rir). is my coop size large enough? we have been looking at coops on this site and have found several we like and could modify to fit my needs. thanks wayne