I've edited the image from Ian's observations.
I've done some Photoshop devilry where the Trifid now has the body of a Honders 12 inch and the head of a CDK17!
So more detail in the centre areas and a bit more dynamic range.
Same original links:
https://pbase.com/image/169826418/large
https://pbase.com/image/169826418/original
It pays to archive earlier data for adding in later on. Its a multi year approach to getting longer exposures!
This one is now around 15 hours.
Greg.