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Here is the picture.
4 TMC2100 breakout boards for all stepper motors except extruder. I set Vref to 1.1V, otherwise they get too hot.
The motor connections must be swapped, otherwise they rotate in the wrong direction.
I removed the power supply case because I did not find a silent fan that fits in it.
Two Noctua 6cm Fans cool the power supply and the mainboard.
6cm fans fit exactly in the case. Just use double sided tape to secure them.
The cooling of the stepper drivers is not perfect though. But I dont have problems with it.