I agree, the only one that went into the "most" detail was probably Andrew Maximov's? tutorial with his Cerberus pistol model. Even then, it was just a quick video breakdown. I haven't actually seen someone complete a tutorial with a start to finish, multi material PBR asset. That would be awesome. One thing I would be…
I'd love to make some kind of tutorial once I'm fully comfortable with PBR workflow. Right now I'm dedicating all my time for this stuff, it's really really interesting.