Quite a while ago I saw this concept
by Pavel Proskurin and thought I'd give it a go.
Here's my progress on the high poly so far. I think I'm pretty much done, but I figured I'd get some feedback before beginning on the low poly.
I've had to invent some bits that didn't work out in 3D very well or were just obscure or vague.
Eventually I'll be texturing it in substance painter.