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I also like "beefier" so no disagreement from me other than the points I mentioned but the design is clearly a comprise on strength vs weight. So much so that I don't believe that the load bearing arms can be moved without comprising the main column. If it were to be a permanent site build, I...

I'm not so sure. A slight amount of deflection might more accurately represent the forces we actually experience in a tree. The rigging testing would be done using tree limbs strapped onto the structure, if I understand Nick's intent, so there will be shock-absorbing deflection at any rate...

That was my thought too. I think it's a great idea and would make a versatile demonstration platform. Nick, is your thought for this a permanent site build or something that could be transported?

True, but round could be made strong enough and would allow pivoting the arms into many different configurations. Like having the drop zone not being directly over the lower bracing.

Think about making it from multiple sections of sleeved round tubing. It could then be fully adjustable in height and limb/arm placement. Opposing cables with turnbuckles would facilitate adjustability and be far lighter than bar stock.