I've run groups like this before and I think it works fine, as long as weare understanding of everyone's schedules. This story is probably not fit for more than 4 main characters anyway, it would just be too cluttered. 

Also, I like the organization that these little tabs provide, along with a running cast list and things like that. There is no reason to move this anywhere, I am very happy with the asthetics of this as it stands.

EDIT: Check out that really cool image I found on deviantart. A really interesting play on the Ouroboros.