I know that guy that takes his surfboard on his bike. He built some L brackets and had them mounted to the frame in 3 places. Not sure if they were welded or held on with pipe clamps.
It has to be out far enough to get your leg in between it and the bike.
A snowboard should be a lot easier than that. If you have engine guards and bag supports on the back that should be all you need. Pickup some Steel to made your brackets from. Use tie wraps to hold the board in the bracket.
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