Damn what a failure is this, look below.
I thought the distanceshaders' mask wasn't THAT obvious and also that the density of shapes would be less.
Also the lighting isn't near anything similar to the tests...
Back to the drawing board it seems
By the way, the approach for this technique is based on FrankB's cumulus pack.
This consists of 2 cloud layers mixed with different noise scales to avoid boring bottoms of the clouds.
Martin