Sounds as if you are going about it carefully and getting good preliminary results. I'm glad I was wrong about the 2x4s bending. I don't know how much mule tape stretches. Ideally a tensegrity prism should have tendons that don't stretch and struts that don't bend. I've had to re-tighten my amsteel tendons after a while. One thing I don't understand about your account is the reference to 8 side tendons. I don't see 8 in the photos, and a four strut tensegrity only needs 4 side tendons, 4 top tendons, and 4 bottom tendons.
In the pictures it looks like one of the side tendons is tied to the wrong strut at the ground level, but you've probably already corrected that.
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