Quote - I'm not near enough...but I have used 2 layers of alto stratus on Nakuru spectral Sunset

As I said above. That atmosphere preset was just the starting point. You need to go into the atmosphere editor and adjust many of the parameters in order to get what I posted. The predefined cloud layers won't help much either without significant modification. The one in my image is a custom layer that I made based on what I learned in a bunch of tutorials (AsileFX, GeekatPlay, etc.).

I'll post some screen shots of the basic atmosphere setup in a few minutes.

Ciao

TD