I have replaced the birdhouse today with a new (and hopefully improved) version. The new features include a wall to wall scale on the inside and the electronics, solar cell and antenna are now all in a single enclosure on top of the roof. There are a lot more smaller enhancements which you can check out in the Version2.0.zip file if you are interested (I have moved all of the older design files and images into the Version1.0.zip file).