Looks great, and def something I would try. What's the story on the waitlist, how soon do you anticipate granting accounts? I have two novels I'm working on, both have very detailed chapter breakdowns and a few chapters written for each. I have more story ideas that are roughed out and a more brief outline that could also be further developed with a tool like this.
I wonder if it would be possible to seed something like this with sample chapters I've already written to help guide the style or 'voice' of the writing. Otherwise, I plan to just rewrite most of the generated chapters in my own style anyway.