Can I brief you in English? No problem to share you all the info and my experience.
It takes me some time to translate into German, but no problem to answer me in German.
The material is cheap but it takes many hours to cut the pieces, the fixation is an accurate job! Fixation only with the side skirt and not with metal body (different expansion coefficient)
Next I’ll make trim rubber for the front, give me some time to give you more details and drawings.