I've just built a pier and made mine 110cm.
I have an 8" LX200GPS, housed in a roll of roof observatory.
I used a tripod in the obs first and measured the height from that. The main reason I picked that height is I wanted as much clearance over the walls, but I had to be able to close the roof. So when it's parked with the tube horizontal the roof still closes over the top of the setup.
Cheers
Stuart
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