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Mate, go for it.
I ground a 140mm plate glass(19mm) mirror some time back, had a pile of fun doing it too.
Never finished it, tho it's all polished out(no streaks or pits) but not yet parabolised or coated, just spherical.
Still had a first-light with it, of sorts... on the moon, the only target that was bright enough for the polished glass reflection to be visible, worked a treat.
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