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Robert, if you can go the Observatory route then it really doesn't matter how big and heavy it is. I have had a 16" Dob and had to let it go due to my age and health issues. Building my observatory was the best possible outcome. You talk of 16" Cassegrains, but think about the field of view at that sort of focal length and what you intend to do with it. Define your goals first before deciding on an optical design.
Personally, I am not a fan of "artwork" dobsonians, because up to 16-20" the commercial products are a much more cost effective investment, and you will generally be able to re-sell it down the track. It depends on what your buying it for obviously.
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