16 hours and a good result! Definitely worthy of the main forum. Though that's a phrase often used out of politeness, when you're imaging at your high standard and technical challenge (10-min subs, HaLRGB etc), you want to get some feedback from the top-class astroimagers there.
From my limited experience, I would add a couple of thoughts. First, as already said, the processing is a little heavy, giving the mottled look in the dimmer parts. It might be best to leave a little of the noise rather than going too hard on the noise reduction?
Second things is the quite soft and irregularly-spiky stars. I'm not sure this is a focus issue, and it looks like something I'm dealing with (though on a Newt, not a Cass) - could it possibly be collimation? If anyone else knows what produces these kinds of spikes/flares on brighter stars, I'd love to know too! I'd guess that an ideally set-up SCT wouldn't normally have stars looking so spiky, but apologies if I'm wrong!
But forgive me, it's a minor criticism (as you asked
) of a very fine and deep image indeed, and a lot of time and effort you've put into it!
