We used a little flatbed trailer we got from a neighbor. The boards had rotted off, so we used a welded wire fencing roll and double layered it for flooring- attached to the trailer frame.
This coop is for our layers so it has a roll-out nesting box and roosting sticks.
The roof is slanted one direction. We attached a gutter and a flexible downspout with a little charcoal filter to a rain barrel so our girls collect their own rain for drinking water, that way we don’t have to haul water to them (for most of the year).
We live in the southeast so there are large air vents at the top of the coop covered with hardware cloth mesh, so it doesn’t get too hot inside. Also used a reflective metal roofing.
More pictures and videos over on IG @grant_cloverblossomfarmstead