I'll be building a coop and run when the weather breaks. The question I have is, does the inside height of the coop count as square footage for the chickens? For example: if one coop is 4x4x4 (LxWxH) and one coop is 4x4x8, would the second one hold more chickens? Or is the height of the second coop just "wasted" space? Any ideas or opinions? Thanks!