Group Book
Heck yes, I would love to see this happen.
So, I've done a group novella before in an interactive writing class, and it worked out pretty great-- we began by choosing the first scene/overall plot of the story's beginning as a group. Then, one person wrote the first chapter, a second person continued where they left off with the second chapter, and so on. The issue with each person writing a chapter by themself, is that no one had to agree with the content whatsoever (So, I took advantage of that by making a humorous hippie appear out of the sky in our story, and one classmate randomly threw in a kidnapping). Also, only half the classmates felt comfortable writing an entire chapter by themselves without any groupthinking/teamwork. If I were doing that class over again, I probably would've wanted the professor to do teammates for chapters (like two people work together on a chapter), or let all the students contribute to each chapter in some way- maybe by giving out setting, character, dialogue, etc. to the students.
So idk, just stuff to think about. The fact that Prose doesn't do groupchats (as far as I know) makes this even more of an adventure. I'm really excited :)