I've seen a lot of success using kids play houses. Like the ones fischer price makes. Browse CL and look for that, a large dog house, shipping crate, or the play scapes for kids. Use any of those, pick up some 2x4s, for the roosts. Buckets on their sides for nesting boxes or cat litter boxes.
If you need a run, look around for a dog run. Some times can find them for $50, but most cost $100-150 in my area. Cover the top with shade cloth. This will work.great for keeping chickens in.
If you have a high predator issue, cover the sides with the hardware cloth and zip tie it to the dog run.