OK, I see that now! I missed that the first time around. Sorry about that! That reminds me of when I had my first apartment and used to put a piece of wood in the patio door track, for extra security.
That is really great! I would love to have that! It looks very functional in design, as well as looking good. I bet your chickens love it.
You might want to think about upgrading your wire to something a little sturdier, though, especially since it looks like you don't lock the chickens into...