I built a simple coop over the weekend. I'd like to build some kind of door but access from the out side to open and close it. Maybe some kind of sliding door. I cut the hole into the middle of the coop for the run. I'd like to lock them down at night. I found this in the Internet which is pretty similar to the one I built. The nest box is in the back. Where can I get the big sardine can opener from? Lol Or what are you thoughts on it.