Mark , I had a go at this a little while ago. I used DSS, siril and gimp. I used 3 layers in GIMP:5,30 and 60 sec. I stretched the 60sec images to get more of the outer nebula. The inner areas are still a bit bright, but I can see the trapezium. My camera was an old cannon 600 D in terrible Brisbane skies. Gimp had functions for rotating and offsetting the layers to get allignment.
best of luck with the merging. it was time consuming but fun. Rob
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