Over six months, I scoured the internet for West Marches resources. Ultimately, I produced something that could be played with a rotating cast of players in a persistent world using D&D 5e rules. 5e was chosen for its popularity and perceived accessibility. I used strict GM-as-neutral-arbiter style play with little to no punch-pulling.
After nine sessions (four hours each) across twenty-something players, I can call the project a conditional failure. Very little emergent play manifested. As an experiment, it was a success since I’ve learned much in a controlled setting.