Why not ask what I want to do before telling me it won't work out? It's just an interesting idea, and I'd like to see what develops out of it.
I'd second the hovercraft idea. There are mountains of patents for new propulsion systems, and only one or two have been done more than once.
Pictures! So you'll know where I'm starting.
A while back, I found an image of an old airboat. The more I looked at it, the more interesting it became. I'd like to prepare plans for it....