My husband is in the process of building our coop and I just want to make sure we make it as safe as possible. My babies will be locked in the coop each night. If there are no gaps in the wood by the door and window, can I pretty much consider them safe? I am going to put a carabiner on the latch to make sure the door cant be opened by any animal and there will be hardware cloth on the inside of the window and any vents we put in. The coop is about 4 inches off the ground and whatever animals dig underground would have to get through two pieces of plywood to get into the coop through the floor. The coop is under trees so predators can drop in over my fenced back yard to try and get in the coop. We have the usual nocturnal predators as well as some feral cats around. Will my little babies be safe?