You know it's a bit frustrating really because in many ways the examples in the excellent principled bsdf guide are really quite far from what I am really looking for, which is a relatively reliable way for making use of tileable PBR texture sets. What I mean to say, is that some aspects of the guide did confuse me. For example, if I want to plug in a height map, where do I do that? It's simple enough in the Physical node but not so much in the Cycles one.

Equally, I am presently able to adapt an old Firefly plant/shrub/tree to superfly via the Physical Node but the Cycles way of doing dealing with transparency maps etc just eludes me.