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Buying a dome is really expensive but there are amateur versions that are relatively easy to build and hence lower cost. Big cost I have found was the dome rail, but I solved that today. I can get a 150mm universal "I" beam rolled into a 3m ring with a 2mm tolerance for about $600. My first "quote" was $2k with 30+ mm tolerance... pays to look around!
What goes on top is less of an issue. You can go geodesic or segmented which may be more complex than a box, but offer a lot more in terms of aesthetic appeal functionality and vibration dampening. Potentially, it also uses less material.
Rom
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