Might be a great design if more info was provided, hence my low star rating. How do the chickens get to the different levels? What structure did you use for the coop itself? If the chix spend a lot of time on the upper levels, the floors will become a poopy mess. Maybe if they were built with low surrounding sides, they could be filled with sand or shavings... a more comfortable hangout area. I really do love this design concept, but lots more details and photos are needed, especially seeing the chickens actually use it.
I have not had the pop door blow shut, but it does have pretty large hinges on it from our local Restore.
The only thing showing any wear is the ramp to the pop door, but I believe that's just poor wood on the rungs that could be spiffed up.