I am always on the look out for easy and inexpensive nesting boxes. I found these baskets at Dollar General. I simply cut an opening in each one and then placed one on top of the other and fastened with zip ties. It is big enough for a standard hen, is stackable and will allow nice air flow for any hen that decides to brood eggs. Yes, I know the opening is not straight, The knife slipped but the chickens don't mind.