Ok.
Nesting... do they need seperated "nests" or would they share a large one?
Will most any container suffice?
They should have separate ones, sometimes chickens don't like to hear with each other, or use one box when you have several, but it's best to give options or they may lay elsewhere.
Anything can work, some people cut into buckets, others use wood. Personal preference generally, depending on how your coop is designed.