I love it when someone does something that makes me see an "old" object in a new way. Your Ha data is the first time I've sensed the prominent dust circling back around a central glowing nebulosity. In LRGB the dust bar seems "just there" rather in an otherwise smashed-up (but spectacular) galaxy.
Maybe its just an illusion of the direction of the image or Ha, but its still a fascinating shot Sauvi.
You obviously also revel in the technical challenge of wringing ever last % from your gear too.
