Scrap nesting box
We built our nesting box from scrap wood we had from an old barn we tore down and other scraps from previous projects. The dimensions were modified based on the width of the wood we had on hand. It's not very pretty, but it was free to make and will be inside a chicken coop. Our chicks are scared of it right now, but they are only 8 weeks old and not laying yet. I'm sure they will like it when they get used to it.