Here's a picture of mine. Took an old kitchen table, lino tiles on top of that. Then framed with 2X4's. Painted it all for ease of cleaning and because sealed wood helps with mites, etc. (not porous for them to breed in). I used snow fence (wide holes) underneath the roosts to keep them from dust bathing and/or eating it. Hinge on the wall so I can lift it up, hook it, and scoop the poop every 2nd or 3rd day. Garbage can is on the bottom left. It's small, so gets full every 7-10 days and then I empty that directly into the garden during winter, in summer I put into the composter.
Everyone comments that my coop doesn't smell like a coop.