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I'm sorry I was thinking you were going for a plate standing on four 16mm threaded pillars.
I did basically the same as you intend with the top plate for my AP1200 GTO mount. The mount was 2nd. hand and I got a machined top plate with it from the vendor. Apart from anything else this gives a dead flat machined plate for the mount which you cant be sure of with a welded pale on the column.
I did stand my old traffic light mount on 4 x 1 inch shafts which I used to adjust to try and keep the column vertical. This was only to try and minimize Polar alignment drifting without any great success. This mount is only use for short FL stuff mainly with FSQ or even camera lenses. With short FL imaging Polar alignment is hyper critical so that for me anyway even with perfect guiding stars in the corners of a big chip show definite rotation on anything longer than 5 mins whereas 30min integrations on 2.8 meter FL is no problem.
Can't see you having any worries with that mount and column
Brian
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