Awesome image Mike, I always enjoy your shots of the more unusual targets - or the old favorite targets with a new twist. I think it's great to capture such details at the very edge of what's possible.
I once did a Trapezium as well:
http://www.titirangiobservatory.com/...trapezium.html
It's upside down compared to yours and a lot less exposure, but pretty much the same FOW. There is so much to look at in that area!