I have my first hatch coming off my 1202 bator hatcher. It came with solid wood door. I though it was just fine and remembered Gary/Geareduplyn telling us a window was what got a lot of us in trouble. Gotta tell you it is hard not to look in there when you can hear them and so forth. I may break down and get the plexi door after all. What day do you open for the first time if you cant see in there? 22 or 23rd day? Late day 20 now and I can hear a couple of them at least. I am weak.