Good luck! We had five partners in a C-120 at one point, it was great, super cheap, virtually free of conflicts. A great way to go.
One thing we did do, we assigned weekends at the beginning of the season. Every fifth weekend I'd have the right to go fly from Friday afternoon to Sunday evening. If I didn't make plans I could release it to the other partners on those days. It was nice to know it wasn't necessary to jockey for access if I wanted to use the airplane to go somewhere. Trading was allowed and if you weathered out, you weathered out.