I'd use an opaque material with an inverted fresnel effect for the glow, you could use a mask on top of it to add in wires, overlaps, and wrinkles on top of it.
And to add to this thread myself, I really enjoyed this thorough breakdown by Jared Sobotta on some of the rocks/cliffs from The Last of Us: https://www.artstation.com/artwork/4965R1
Add a paint layer on top of your stack of normal layers, set its blendmode to passthrough. Add an anchor point to that, and use that inside whatever generators you're using.
I know right ?! Add on top of this that a propeller is actually an airfoil, but twisted so it makes a "screwdriver" shape in order to "scoop" the air and create thrust. Thanks for feedback ! :)