Tried BenP's blog again today and its working now . I would be very grateful if you share your compound once your happy with it. As far as community project goes I think its fast become one with all the responses and renders coming in.oh. BenP's blog works here from UK fine! was going to try and make the billowing stuff work as I wanted on a sphere first before trying with more generic cloud shapes. I would definitely be up for sharing the compound once its working correctly, perhaps this may be a good candidate for a community project. Evolving & billowing clouds... certainly a useful compound!
I'm also trying to see what I can get working with the cloud primitive setup. I've got a particles looking like your first test Cube Powah v1 only on a sphere, but thats as far as I got for now.