We built the nest boxes so the eggs can roll-out to the back side following plans posted by "Opa". I only plan on using that feature if I ever get an egg-eater. Until then, I will give them some sort of soft nesting material that they can fluff-up and make a mess out of. I made the nest boxes pretty big too, so they would fit neatly where I wanted them. Since my girls are all used to sharing one big nesting box, I wouldn't be surprised if several will crowd into one box and leave the others empty. Thanks for all your good ideas!