I painted the walls but left the roost wood. Remember to leave enough time for the paint to cure and all of the fumes dissipate. It depends on the humidity, took about 4 days for my coop.
I would lower it a bit, it only has to be a few inches above the nesting boxes.
a good tip: make a poop tray with sides about 2 to 3 inches and fill it with Sweet PDZ. Safe for chickens and you can just scoop the droppings up with a kitty litter scoop. It takes about 3 minutes a day.