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3 or 4
Hello Paul
Good luck with your build, some comments if not to late,
3 or 4 bolts, 4 is no harder to plumb the pier with than three, just think of adjusting the bolts on a diagonal pattern. Bottom right, top left as one adjustment pair, bottom left top right as the other pair.
Mpa, not really an issue, you are going to mount, what, a mount and scope weighing, say 100Kg's and your mass base will be about 2.5 tons, the bolts won't pull out of poorly batched 15Mpa concrete. if you are worried 35Mpa in theory is water proof.
I am a licensed builder and built a dome and Obs 2 years ago, your mass base will be fine, don't over think it.
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