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Wow, awesome plans.
Being such a huge mirror, you'd want it to be ready asap not waiting all night...
So, you should be able to work out the acclimation rates between the materials since you have a thickness and size.
The question is then, are your hourly rates of temperature lose great enough to justify the expense of the low expansion material upgrade... (oh and how much deformation you can have and still collimate, which wouldn't be a lot at F3.5)
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