First thanks @Gordon
for the data.
I decided i wanted to try something really different with this - i wanted to get the cocoon really bright and contrasty and get away from the standard colours.
So, in PI
registered and cropped the 3 files
Gradient removal with ABE
Very little in Sii so decided to work HOO only
Noise reduction on HA
Several iteration of HT and CT
Gentle stretch on Oiii
Masked and stretched only nebula
Pixelmath to combine as HOO
into Photoshop for some selective colour saturation and
pack to PI
Convuluted the HOO
as a luminance
Some curvs transform
Back to PS for some selective high pass to improve contast in the nebula
and save as JPG to give....
So i definately got "diffrent" and "contrasty" but I'm not sure I like it very much
But it was fun to work with and i may go back and try something more conservative if the skys stay cloudy.
thanks again Gordon