Sorry for the delay and thanks for the links.
Here is an example, which i´d like to rebuild in Arnold. If its too illegible i´ll post more zoomed pics.
Was told, that "if you were just using principled bsdf then it should be possible. There is mostly a 1:1 mapping between that and the physical material, but there are some subtle differences..."
My issue right now is, that i cant tell where to start to rebuild this.
You need to understand what the nodes does first.
If you understand their inner concept, then it becomes a more natural thing.
That means you in the head that a mix node can also be called interpolate.
Understanding the actual functionality is adviced, this way you also know how to deal with the Bump and normal map, where in max, you need to wire things differently in order to obtain same result. So before doing that part, you need to go into max and make a bump+ normal map work correctly before looking into copying your blender noodle over.
And so the first section would look like this.
