Not to be a lurking leecher, here is what I've got so far. I invested some more time (thanks to all, who replied, especially @FrankPolygon) and now I’m halfway to a complete solution. First of all, I found this topic on StackExchange. I created the same node, and closed that (ahem!)king gaps: I used completely identical…
"Same goes to MoI or cad done models . Even if you have to re-do some tessellation parts projecting UVs back is usually simple and done together with vertex/split normals ." Yeah picking up on what gnoop said, a few industry guys I know of swear by CAD workflows which I suppose their inhouse pipelines may support i.e. CD…