Your going to run into serious tube strike issues near the meridian with that width of pier. I've just had to have a skinny pier built for my EQ8 because my existing 10" one was way too restrictive.
And BTW, my 5", 1.3m pier carries nearly 100kg of kit and there are no flexure issues. (I didn't say there is no flexure, what ever there maybe is accommodated for by pointing algorithms and guiding).
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