PVC might be cheaper than any kind of wall. Bottom end of PVC tube can be cutted by the diameter of the tube and pass through the bottom base. You keep the threaded rod tension, half the tube is still pressing against the base, the other half of the tube, passing through the bottom base, makes a foot for the sturcture and allow you to have each motor off the soil. I have no CAD of drawing software handy to make a draft, sorry ...
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