Man, that's a huge effort Paul, good on ya for giving it a shot.
Even if you put in enough hours to get the SNR to be theoretically the same as a dark site, I think the data is still going to be very challenging to work with. IMO galaxies really need dark skies.
I second the above comment re the "walking noise" in the image. Did you dither these images? It looks like you didn't dither and if that's the case I think you'll find you could make quite a big improvement by doing that. Maybe something to think about for next time.
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