I finally finished the Dragonkin models (there was some jiggery pokery with the uv maps after I’d finished the claws) and restarted Red.
It was supposed to be a simple case of append the male Dragonkin model, append all the materials I’d already done, do the horns, do the multires sculpt.
It was not a simple case.
I redid the shaders, backported some of the modifications made (knocking out some extraneous colour nodes and adding in some forgotten bump nodes, good thing I can run multiple Blenders) and then started working on the horns.