looks like a really good plan Hugh.
only thing I would do is have a closer look at the 314L+ with the icx285. Doesn't have as many pixels, but will be between 2 and 4x faster than the 320 due to bigger pixels and much better Halpha QE. depends if you want the ultimate resolution though - bigger pixels cost a little bit of resolution in the best seeing.
set point temp is no big deal with these cameras - the chips have vanishingly small dark currents.
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