It's been a while but I've been busy.
Here's my first foray into OIII, NII and SII imaging and processing so this is still a work in progress...
TEC 140 with an FLI ML16803 camera and Astrodon filters (3nm for the narrowband work)
8 x 1500 secs Ha, 18 x 1500 secs for each of OIII, NII and SII, 8 x 200 secs for each of R, G and B.
Image processed in PI and PS. Reduced in size by a factor of four for this preview.
If the bright background of the forum is a distraction and you use Firefox then right-click on the image and select "View Image".
The colour palette is a little non-standard, being ordered by atomic weight (or cosmic abundance) with Ha in red as usual, oxygen in a deep orange, nitrogen in green with a splash of blue and sulphur in blue.
That choice, together with different stretches, resulted in areas where nitrogen and sulphur were relatively plentiful tending towards white. Areas where sulphur is more dominant tend towards magenta courtesy of the Ha contribution while areas where oxygen was detectable, mostly close to the bright "core" do come through as orange (the yellow areas are mostly due to mixing of the other colours rather than oxygen).
To my eye that palette tells a story in a more intuitive way than the more normal ones with, intriguingly, the heavier elements concentrated more towards the periphery. What do you think?