I am building my first nest boxes for the coop. The 3 nest boxes will be internal to the coop, but I have an access door on the outside wall that allows access to the back of the nest boxes to collect the eggs. The nest box design I am thinking about building is based on using plastic dish pan/bins from the Dollar Tree. The bins would be set on rails and the bin itself would be removable. I have read some old threads on this concept and have watched a few YouTube videos about this concept. Advantages: Removable bins, easy to clean and/or replace, broody hen can be moved with bin and eggs all at once, plastic dish bins are only $1 each. Disadvantages: ??? Nobody mentions any disadvantages of this concept. If anyone has some disadvantages to using these plastic dish bins for nesting boxes, please let me know. Or, if any has some built next boxes with this concept and it works just fine, I would like to know that too. Thanks.