That looks pretty good.  It may solve the toenail issue on L'Homme that ghostship2 discovered.  I see that the Bright/Contrast node has been omitted from this setup contrary to Caisson's original presentation.  I don't see any practical need where the nails are concerned.  The shader looks functional, I can't see anywhere for any node reduction or better improvement.  Since each channel on the PrincipledBsdf node is a multiplier, it is best to work with the nodes as a setup and combine everything at the end.  Nice work.

Edit: One suggestion, rename the Color connector to 'Plug Diffuse Map Here' or something more descriptive to avoid any misunderstanding.