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My 10" uses a 6 point but the mirror is not 34mm thick. 6 point was easy to build but also introduced some design elements that made it interesting to build.
Careful how you read the PLOP diagrams, it uses the same range of colours for the differences across the surface. It's only when you start to interpret the numbers that you realise they are are referring to smaller and smaller differences. With more support points the picture may look more complex but the flatness of the surface is far more.
I used industrial Velcro strips under my mirror. Totally flexible, no need for side retainers and it can support the mirror upside down.
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