Looking @ these neat auto-doors, I began cruising through one of my favorite websites for DIY things. This "instructable" (link @ the end) goes through how to build one yourself, if you have the required tools and a decent "follow the directions" based skill set. I'm sure with a little electrical ingenuity, and spare cash solar panels could be added for really true "green coop". The door is self locking, and has programmable arduino circut board, for setting open/close times. There was another set up one can do, i 'm trying to find it, but one person on the instructables website evenn went a step further, and automated to the point they could open and close the coop doors using their computer, and even cooler, their smart phone! How's that for automation! http://m.instructables.com/id/Arduino-Chicken-Coop-Controller/ I'm still looking for the smart phone set up. Anywho, I have found the instructable website to be superfun, just browsing through what people make to share.