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…
Happy to hear I was wrong in assuming your model was nonspecific. Sorry I've been having trouble understanding, and communicating clearly, I've been operating on less than the minimum required amount of sleep. I can see no technical flaws in neither your Lowpoly or Highpoly, everything seems to be baked and rendered…