@First bit; that's Discworld-grade brilliant, but does the knowledge spread, as it does in Discworld where everyone is Genre Savvy, or is Reed Richards still Useless? Of course, the problem with narrativium is that attempting to take advantage of it is likely to bite you back, but is it better than not knowing?

My very first attempt at writing, waaay back in 2007, was a story about a guy who was thurst into a Narrativium-based world, which was kind of like an immense, live Let's Play for the entertainment a bunch of True Fae children (about three centuries old). Gran't Morrison's Action Comics come to mind. He'd be thurst into different genres asd different roles, and he'd have to start thinking vey meta, very fast, if he wanted to survive each story. He also wanted to get the damned show cancelled without giving a bad performance that would give the Showrunner a reason to fire him (literally), leading to many Springtime For Hitler moments, much to his frustration (sort of like Hideo Kojima and Metal Gear, Hideaki Anno and Evangelion, ... but he also starts to take pride in his work (think Walter White and his blue meth)... At some point, he'd become aware that the way things made "storytelling sense" rather than "logical sense" also extended to the world outside the game. And then we'd have an Animal Man meets Grant Morrison type of meeting.

Most of the references I'm making here are retroactive; I had the idea much before I came in contact with them, but they're handy for condensing. Another work I'd compare this to would be GAINAX's Abenoashi Mahou Shoutengai. In fact, now that I think of it, it might be better to start the story as an Ontological Mystery, instead of having his slavery revealed to him right away as I initially thought.

Anyway, my point here is to say that, almost as soon as I wrote the first chapter, I went on hiatus, because I was keenly aware that I was biting much, much more than I could chew. Even now, I don't think I have remotely what it takes to plan out and pull off such a project. Designing locomotives is such easy work in comparison; all you need is patience and method.

his world-building is a lot more self-aware

It's extremely Post-Modern and illogical in every sense. It is awesome.