Another possibility for an outbuilding:

http://www.strombergschickens.com/st...late_index.htm

they can be used to construct an animal shed, carport, greenhouse, or
even a dwelling:

http://www.motherearthnews.com/top_a...ate_Connection

My husband just ordered a set of the connectors, so I will be able to
give some feedback on how it comes out (hopefully soon

- Susan