Thanks for checking it out, guys, and for the encouraging feedback.
I forgot to mention in my OP that this image is binned 2x2; the full-sized version was a bit "fluffy" for my liking, in spite of very good seeing when this data was captured.
After I've captured the red and green channels, I'll be putting the data up in public space for people to have a play with, since there are folks here who could teach me a thing or two about narrowband processing (to say the least). I've become a bit too comfortable with one-shot color data
Cheers,
Brett