This is something we are currently working on for our property as well though we have to work around the already established house and septic system. We already made one mistake, luckily it's a temporary structure but it would have been so much easier to have 2 doors on our aviary. The only door is far from the hose making it a pain to clean.

It looks good. Is there a way into the barnyard straight from the house? I know you don't want to track stuff in but I would find it frustrating to have to go around to get to everything. You might want to look into getting a boot scraper if it bothers you that much!