Think, though: NaNoWriMo gives you a month to develop the story. With game design, that means you'll need at least twice that to produce something of equal length, and that's working with a team.

This was more RPG mechanic rather than RPG. I still find that interesting, though, as the system I used to make RPGs in high school - RM2K, which is still out there - had the mechanics prebuilt and let you focus on detail. This game seemed to be quite the opposite.