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4 x 100 x 75 posts can make a 175mm square pier if you think laterally. See the attached diagram.
A friend of mine many years ago 1980's built an observatory near Toowoomba. He cut down a large ironbark tree where he wanted to put the observatory. Rather than remove the stump and roots, he decided to use the stump as his pier. I moved away from Brisbane around that time and lost touch so I don't know how it worked. I heard through a mutual friend a few years ago he was still working at his observatory, don't know if the Byers mount is still on the tree stump.
Joe
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