modular birdhouse apartment flat

This design was created to compeet in the #Birdhouse Challenge, and is fully printable and funcional.

UPDATE: 5-7-2013
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i have rotated some parts to the correct orientation.
if you downloaded it earlier please update the files.

Description
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This birdhouse can be expanded to a massive bird tower.

Bolt the base to the wall and build it up to the clouds,
or hang it form the top of your balcony and lower the apartments to window level of the floors below.

Connect them tog