Some upgrades have been made since the video, it's now a little more stable, there's a rudimentary skin (I'm not good at materials, so feel free to do better, and re-upload), the outboard and barrels are colourable, and when you're in water you can extend the barrels a little more so they'll push the back up some more.
you can see what it's like, and how it was made here -
O-niissan Boat 1.0
put it in to top gear, and drive in to some water
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