Hi all - I am currently converting a playhouse into a chicken coop. I plan to build a nest box with a hinged lid to mount onto the coop. Any tips for building and mounting, to be sure that it is secure, weather-resistant and predator proof? (I will of course be latching it). In many ways, rain/snow are my main worries, and making sure there are no drafts. For instance, I don't want any water to leak in around the hinges. Thanks!