I don’t think this went anywhere,
but now might be a good time to give it a go. Nobody has anything better to do anyways. Could learn some building skills.
Also I already made mine:
It’s 4m 1200 rpm with a 4" wheel, which ends up being roughly 15 mph. quite fast for a vex robot.
I think it would be cool to start a challenge to see how fast you can make a robot go using only 4 motors.