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I've made an 18 point cell for mine but I've found its the edge supports that needs to be done really right. My first effort caused a little pinching and produce a slightly triangle star. With a mirror that tall i would say the edge support is going to be very important.
If you're going to mask the edge of yours then i would recommend making a ring rather than vivid as in that image. There should only be a need to mask a 1mm off the edge unless the edge is rolled.
Even my Royce mirror works better with the last .5-1mm masked off with a ring i made in my lathe.
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