Is that deer netting that is on the coop? If so, its just a suggestion,but you might want to get something a little more predator proof. Like using the hardwire cloth thats super tiny. Your girls would be more secure. A raccoon could tear right through that netting.
ETA: On a side note, that is waaaay to small! How in the world are you going to fit those 16 extra birds in there? Trust me, always build like 8X's what you really need. Chickens are addicting! You only have three right now..but wait..you'll see.