Hey there! Just a friendly word of advice from someone who learned the hard way. (unless there already is some there, but I didn't see it) You should put some wire or something on the floor to keep critters from digging a tunnel into your coop at night. Weasels, racoons, fox, all kinds of predators will dig to get to your flock. You probably already know that and if so, i apologize. maybe my comment might help someone in the future.

I lost 2 birds when I first started because we used a coop that was already on our property that we moved to. It was built with a dirt floor, nothing to keep predators from digging under.
I wouldn't put wire on the floor unless you plan on digging down, placing the wire, and then covering it with several inches (maybe at least 6) of dirt. Chickens like to scratch around and the wire floor could cut their feet. Going down around the outside of the pen 6-12 inches and covering with dirt or straight down a foot around might be better.