West Marches-style Sandbox Campaign

Ben Robbins had what looks like a very good sandbox campaign, and a remarkable way of managing PCs available at any given time. This post describes how I think I’ll go about giving it a try, because it sounds like it’ll work very well for me, given the difficulties I’ve had in maintaining a steady group of players online… and the design requirements for any particular session are relatively small compared to my normal campaign design mechanisms. I’m looking for players and possibly co-GMs.