Thanks Trevor and Marc.
Marc, yes it's quite a windy site, but placing it up high on a mound I'm hoping it will help with seeing conditions. The outer frame can sway a bit that's not a problem, the inner frame which is the Square pyramid (my "pier") does not touch the outer frame at all and there is not much of a sail area for that to catch the wind.it is held down well and extremely rigid. As for vibrations on it, we will see. I can always clad the outer frame to deflect wind away from the ones frame.
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