Here is the design that I am looking at, much more efficient and certainly safer than the Yankee which is what went down in NH.
http://www.airboats.ca/
Hovercrafts can be just as treacherous, the gentleman that owns 1000 Island Airboats lost his best friend in a hovercraft accident which prompted him to do the research and invent this type of craft. Another problem with hovercrafts is the payload capabilities, certainly a lot less than an airboat.