I guess for me it was never about staying away from manmade materials, the off-gassing of vinyl has me concerned though, but I tarped a lot of loads so I think that would be negated.
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I have dreamed of creating a yurt, ger, round house, call it what you want.
For the sides, I have wanted to find a manufacturer of cow bale feeders to make an extra large one. But I also like how steel scaffolding goes together and have dreamed of putting a curve to this type of a design. But I like portability, so I was thinking curved pvc pipe.
Lots of ideas, but time and motivation.
Mike