It will not be the 2d clouds mode from Sol. I decided to integrate full 360° skydomes. They have some downsides, but the real advantage is low gpu and cpu usage (nearly none) and a very good looking. The whole system already works.
It has already a "fake cloud shadow" mode, where a 3d cloud layer only generates 3d cloud shadows. So you have the feeling, there are clouds in the sky. Currently i'm in the texture procurement phase. I'm clarifying the licences.
Pure will then be released with a default "set", which contains a script and textures. In this script, the textures usage per weather and sunangle is defined. The whole system is written to have a multi set system. So people can build their own 360° skydome set with Pure. If multiple sets are available, you can set them in Pure Config. That must still be done. But i think with the next public development release, this system is already integrated.
Here are some pictures:
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