I am fully focused on this now. Today I finished pulling everything into organised folders for the sake of my tiny, fraying threads of sanity, and wrote up the first new section.
There's a bunch needs writing up yet but a lot of it is smaller stuff. The Traits, which are this game's version of Classes, each need a bit of background, but not all of them need much. I just need to move the intro text currently sitting on the character generation section and keep that clean as just the Traits, Skills, Bonuses & Penalties, and put the background in a separate section, expanding on some of it as I go. And when I put it all together everything will link to each other!
This is a big task. But I can do it!