In the last few images i used a mix of cloud color,scattering
color and the vector coloring,so a start has been made,but
as always more tests are required.

Edit:I didn't mention earlier,'cause first i thought that the
normal cloud coloring would be overridden by the vector
coloring.
As for the thick cloud layer, believe it or not,that's almost
exactly what i was going to try
next.As soon as possible,that is.