That’s close enough and really awesome!
How would I render something like that in layers (equirectangular images)? Like, foreground clouds with alpha, background clouds with alpha, sun/moon with alpha, backdrop sky. This way I can do some tweaks/paint-overs and use those layers in non-volumetric skysphere/skybox.
Oh, almost forgot - does it work with RTX stuff (GI and whatnot) ?