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I don’t think an 18 point cell is much more onerous than a 9 point cell and you do have lower tolerances the higher the number of points. That being said, it’s worth building your cell as accurately as possible.
Here is my cell for my 14” hubbleoptics mirrors. I used 5mm aluminium for the whiffletree and the bearings are positioned to be at the centre of each layer of the sandwich mirror. Works fine for me.
Orange knobs are for collimation - Makes it easier having them on the front.
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