Thanks a lot, guys. Yes, I'm feeling better now. Made the experience that much stress (at work) can have a larger impact on a body than expected. Fortunately my doctor decided to sign me off sick for a few weeks.
Kadri, I already thinned out your setup, so it's not too hard to render it, but once you have athmosphere and clouds receive shadows, it takes ages.
And yes, a real killer render monster would be great!!!!