I have an 8x8 coop with a 3x8 dropping board with roost above. Can I count the 3x8 area in addition to the overall 8x8 when calculating 4 sq. feet/chicken in the coop? I'm trying to justify keeping 20 chickens in a 8x8 coop with a 9x18 run. The chicks are now 7 weeks old and two are roos.