Finally it's done. For almost two years I've been hesitating and was thinking about how to invest my money reasonably. The result you can see in the pictures. First time ever for me in custom watercooling. Unfortunately the pump is pretty noisy, even when it's working with 1500 rpm. But it was cheap because except from the upper rad and the tubes it's all second hand. A low budget custom loop so to say.
Edit: The pump itself is as quiet as it should be. It's actually the PSU shroud that sends all the vibrations to the whole case which was really annoying. But I put some foam between the pump and the shroud and it helped a lot. Still not perfect, but at least I can now sit next to my PC without going deaf.