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I love how these look. My concern is the paint inside like others have expressed but you have no clean out place.. At the end of the season those need to be cleaned out from all the old nesting and bird poo so they are ready for spring again.. You have glued everything together.. I don't know if a trap door on the bottom can be made. Cut out the plastic the put a hinge on it with a closure affixed to it .. But the screws would have to be flush with the bottom. Or if there is a way to make the back circle a clean out door.. I do love how they look. Awesome job explaining how you did it..