I have just about 8 people interested in this, so I have updated the OP in the thread linked in the OP of this thread with a proposed ruleset. It's basically the official Nintendo one. Suggestions for additions and changes can be made in that thread.
For those interested, registration for the league is now considered open, so if you'd like to take part in this, head over to the thread linked in the OP and sign up. Looking forward to having some fun with this.