Since I moved my system into the Jonsplus i100 Pro I wanted to rebuild the whole loop with hardtubing but never found enough free-time to do so.
Now I finally managed to get it done, it took me pretty long to get everything together.
Some tubing runs did not turn out as nice as I wanted them to be, so eventually they will be replaced.
Given that I'm already working on my next project I most likely won't put much more work into this build.
So I'd say that this is its final form.