Not sure if you would be interested or not, but I am doing a giant college football style league. It's 70 overall teams, but it's broken down into five 12 team leagues and one ten team league. Still putting finishing touches on the site, but here are the bylaws: https://docs.google.com/document/d/13OV0SupgFXjCXUnjcXWIZyFJFheZUzETntqJNJWiUnw/edit?usp=sharing
I am looking for replacement owners in two long running leagues for 2019. League fees are through Leaguesafe and the entry fee is $200, but in 2019 it is only $100 for someone taking over a replacement team. If interested, I can email you the constitutions and teams available. Email me at firstname.lastname@example.org for details.