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I would worry a little about using a rock. Perhaps it is just the geology of the last two rural properties I have lived on but in my experience things like rocks move out of the ground over time with the ground expanding and shrinking with moisture. In theory you would reckon a concrete footing would too but they don't seem to. Perhaps the square shape makes the difference, or perhaps the ground being covered by an observatory would do the same with a rock (Avoiding moisture changes)
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