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Is there a better material than treated pine, for building tree houses?

Is there a better material (stronger, more flexible, lighter in weight, etc.) than treated pine(?) which I usually use for building tree houses? These are some things that I find very useful in tree ...
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Sources for small metal tubing?

This is more a DIY question than a home improvement one but I can't seem to find a beter place to ask: I'm looking for small diameter metal tubing, specifically 0.159 ID, ~3/16 OD (the inside ...