When building your own coop, how do you make a homemade door and homemade nest box outside door waterproof? Pictures would help...I just don't see how we can do this. I'm not building it, but I'm the "expert" and he's just the handyman. How does a door have to be framed/weather stripped/insulated to keep rain out? Same with making an outside door to an inside nest box--I want to get to them from outside, but how do I keep water out? Any visual references are helpful---I'm a little challenged that way... Thanks! ETA: Our "prevailing winds" are from every darn direction--our lot is in a little valley, and here in Missouri, the wind can blow in circles even when it's NOT a tornado warning!