I absolutely love this! It's tight, interwoven, full of flavour and nuance, and would be a breeze to run.
I did notice one thing that felt like a bit of a logical inconsistency: in the intro writeup (which is excellent, btw), it mentions that the Olms are blind. However, in C8, there are paintings on the walls telling their story. I know my players would immediately want to know how they painted without being able to see.
Regardless, thank you so much for writing this! It's outstanding, and I can't believe you're not charging for it.