Hi Martin,
yes this is based on the cumulus pack, but it's one (small) evolutionary step ahead, mostly because of changes in the lighting strategy. I figured there are many ways for a proper lighting, all of which deliver similar, but not identical results. Of course, once perfected, I will update the cumulus pack (yes, it will be delivered automatically to everyone who has it).
I will most likely render a few variations (especially on shape details) and post them here. I would like to get feedback then which version looks best.
Cheers,
Frank
PS: sorry for the boring terrain, it's just a placeholder I'm using over and over again while developing new skies.