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Hi, Ambermil,
No I haven't, I make a lot of different items and find that if it looks right it is right.
The 15 point came about by trying to remove the flaring between the three point supports. Not very crucial on such a solid 12" piece of BK7, but its effects will benefit making a cell for a larger, thinner primary(I won't be using 45mm+ of Bk7--too heavy at 20" plus).
All this is in practical theory, you make it and test it! Not sell it off paper and hope it works, old school I know but 100% good.
With a 10" mirror that uses standard diameter to thickness ratio, the cell mainly needs to not impede circulation. With PCD of the collimation they work from equal distribution of mass, don't laugh but you could guess this by eye and only be a nats whisker off. It is the point that it rests with the most stability, but then in the scope its turned onto its edge.
Have a look at the primary holder on some EQ newts you couldn't call it a cell. Now owning a reflector I am thinking static electrical build up of dust more of a concern than cooling?
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