I tried this once years ago with a guard NPC. I noticed there have been ongoing discussions about PBR in Darkmod. So I put the builder priest on Sketchfab:
https://skfb.ly/pqrrC
I enabled model inspector, so you can take a look at all the texture maps. I haven't remade anything from scratch, mostly I brightened the metal parts of the diffusemaps and made metalness and roughness maps.
And here's rendered in Cycles.