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Off the top of my head, and without knowing what you're putting on it, I'd go with thicker top and bottom plates. Something like 10-12mm min. For the baseplate stiffeners, I'd go with 6-8mm. For the wall thickness of the post, 6mm (nominally) is probably fine. You can buy circular hollow sections (CHS) off-the-shelf, but the sizes are empirical. Close to what you've called up would be a 165x5.4 CHS (165mm diameter, 5,.4mm wall thickness).
If you're after more feedback, you'd be better off listing key equipment such as mount, largest telescope, maybe camera that you're putting on it.
What about footing? What's the ground like (clay, sand, rock, gravel, subject to frost, fill or natural?), and what type of footing are you thinking about (bored pier, pad footing)?
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