So here are 12Pics of my solution of mounting the rear mudguard.

From "Stahlgruber" Art.Nr. 268 9393 .
It is an "Anhänger Hinterradkotflügel 22cm breit und 75cm Spannweite"

It is completely connected with the axel and is swinging parallel to the wheel.
It is also very stiff, so there is no wobbling at all.


In the front i fixed it only with one bolt since the original fender is mounted bit out of line/middle. So I made a "long-hole" to middle the plastic fender.
Even so I cut a bit out of the original fender where the belt drive runs through, cause it appeared to me a bit to close to the belt. just for safety.
The drop down towards the back I did on purpose to get the fender closer to the wheel with still enough of space in between.

On one pic you see the small but effective modification on the wiring to the rear lights. Since the cabel is original squeezed between the tank and the ash frame the isolation was already abrased (after 90 km!)

So maybe this will help you a little bit to find your personal solutions.

P.S. Finally I got it registered and drove my first kilometers ---> AWESOME! drive