Great job! I have a coop that is similar to your's, set-up wise. Mine was actually the workshop portion of our garage with a lean-to constructed outside for the run. Size is very comparable. It will certainly do a great job for you and your chickens! We love ours.
What are you doing with the rest of the trailer? You should make the whole thing a coop! LOL! I really did think about getting a used trailer to convert to a coop, but the township that I live in has some sort of strange anti-trailer ordinance. I can have cows, horses, chickens, etc.. but no trailer? Oh well, Great job!!!!!!!!