I'm taking some preliminary notes on screenplay formatting and getting conventions to fit within the fountain file format. In general, the combination of fountain's relaxed formatting and the vim plugin I installed, should make it possible for me to write sensible screenplays without excessive effort, if I go that route.
While the formatting won't be a big issue (barring issues converting from fountain to other formats), I think I've decided that, for the Fiasco idea, I don't want to start by drafting in script form.
My initial thought is to draft it in the form of a metaphorical chat log between the characters. This should allow me to start of preserving the feel of the game mechanics, which I think fits in with my general idea of "Do things in the typical case, then move away as I get a better grasp on things".
Anyway, things are wrapping up over here, so I'm going to get ready for bed now.