Here is a great rustic commercial-quality chicken nesting box.
I salvaged this nest box from a farm and modified it so that it is ready to use in your backyard coop or for a rustic display.

I use these for my chickens and they love them. They are designed to discourage roosting on top so your eggs don't get pooped on. Offers the privacy hens seek when they are ready to lay. A box this size is suitable for providing nesting up 10 hens.
I found that they share with ease. 

Available in two styles;
Blue EGGS 
Red Fresh eggs from happy  hens 

Measures:
24" Tall
14" deep
22" wide