My student-built tractor is coming along. They put the walls up yesterday and are building the roof today. The question I have for you guys is this...There will be approx a 3" gap between the wall and roof. Is this big enough for a chicken to get out? Is it big enough for a predator to get in? They can cover it with wire but I didn't want them to go to the trouble if you guys thought it wasn't a big deal. Take a look at the pictures. And this one I just put in to show my son He is so excited about the chickens!