Ended up putting less time into this than I thought I would, but I'm reasonably happy with it so I may call it a day and move onto something else.
5.4hrs total integration, used drizzled 2x2 for the RGB which I hadn't done before. Luminance frames were only 144s.
Full res is available on
astrobin; high res viewing recommended, the small one attached here doesn't show off the resolution very well.
Edit: Added new image revision.