And this post isn't really about the "clouds", but about high altitude, full overcast, sky coverage.
In FSX & P3d there's a limit to how far away the "full" cloud coverage will extend. I think that this is to keep your computer from crawling to a stop.
So for what it's worth here is my "full" coverage.
40,000 feet over Toronto, Canada in a Cessna 150.

(And yes, it did take a very long time to fly that 150 up that high




