I recently lost 3 of my hens but planed on getting a few more this spring bringing my total to 8 in a 4x4x4 with 4 external nesting boxes. Is this enough room for them? They have an attached 4x4 ranging space but free range majority of the time. I should mention 7 would be heavy 1 medium as i havent gotten them yet.Thanks for your input in advance!!