Thank-you gents. I masked the MSG demarcation and applied the Ocean Grey on Tuesday, then spent the last two sessions masking for the Dark Green. I decided to mask this rather than freehand the green because a close look at the photos on page 1 shows a very tight spray pattern that I never would have replicated.
Masked and ready for DG:
DG applied today:
And masks removed:
I had some small areas of paint peel near the bottom of the Sky Band so will need to touch that up. I also might need to adjust the MSG line a bit after studying the photos further. Once that is done, I'll blast a gloss coat over all this.