Hello together, after several motorcycle-oldtimer restorations I would like to start with the construction of my own motorcycle (Old School) next year. I want to build my own frame around a Harley engine. Since I am aware that this is the most delicate part of the box, I am now looking for ‘TÜV/DEKRA requirements’ (welding licenses, certificates etc.) or experiences of other screwdrivers to prepare me accordingly. Can you give me a few basic tips or Li nks give/name so that I can prepare myself accordingly? Greetings Andreas