I have 4 girls in a c&c cage (we just adopted the 4th from a shelter this past weekend). We have a 2 X 4 C & C cage with a 1 X 4 X 1 upper level (The upper level runs the length of the lower level into an "L" shape on one end). So, I guess a total of 13 sq ft (is this correct?). Do you think this is large enough for 4 girls? A 2X6 is 12 SF so I'm figuring mine is in line space-wise if I calculated correctly. I certainly don't want to not meet at least the minimum C & C cage requirements. Thanks for your help!