Cool stuff. My father was a builder (rough carpentry), so I'd definitely be interested in seeing more about how you build your structures. We were relatively poor, especially when I was very young, so my father got creative with materials when building things on our property. When I was a kid he built a small pole barn exclusively out of cedar timbers he cut down in the yard and re-used corrugated metal roofing material from a demolition job he had done. We also built a large (40'x60') pole barn almost completely out of re-used materials (save for the treated lumber poles) from another demolition job we had done. The last one we did was based off of a 20' flat bed truck as the foundation for a large storage shed. He passed away 8 years ago but all of those buildings are still standing and my brother uses them now, as he took over the property recently from my mother. Every time I go back there to visit I like that every so often I drive by a building my father or grandfather built, and admire the fact that in spite of their age and rough appearance, they still don't have a single sag or bend in the underlying structure.