The link @GrecoMan posted is the method I used. The clamp I used torqueboards mount that are no longer made but there are other mounts from forum members that look good.
What I learned from my mini board is hobbywing max 6 is a powerful esc but the brakes are to noisy. Focbox is not as powerful at the same setup(8s). So now with focbox I’m thinking of going with a 12s2p 30q battery and fitting the hightest reduction possible. Probably 14/38 or lower. Also might have to expose the heatsink from the focbox to get some better cooling.