What a good use for the treehouse!
How is the wood floor holding up in the run? Why did you decide that roosts weren't needed in the run? I would have liked to see inside the actual treehouse part, are there roosts in there?
Overall, I think you did a good job, there just aren't any details about how you built it. However, since you basically just added the windows, nest boxes and run, I guess the pictures do a fairly good job of showing that.
Great use of recycled materials. Thanks for sharing your coop with us.