Have to say this is quite amazing Martin.
I have spent my fair share of time on the Helix so know those outer areas well and how hard they are to reveal. I managed to reveal much of what you have here with
2hrs worth of 5min exp using the AG12 but given the even greater extensions and finer structure in your outer most data, the enourmous exposure time (and certainly superior seeing) has clearly paid off here regardless of the smaller aperture - very cool result
Sheesh, a 60 hrs BiColour
...us manual mortals just can't compete with that
Mike