Ray, looking through the guides for various models it seems that these Nikons are some of the easiest to modify. Take a look at the Sony A7 series - about 5 times as much work.
Regarding CWB, apart from the brightest nebulae I'm thinking it might be better to stay with auto white balance to pick up the most Ha.
It just occurred to me that, with the extra signal from Ha, I could drop down to ISO 200 which might reduce the red intensity and get more dynamic range.
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