My dad showed me this really awesome video of this Plane/Car/Boat. The videos can be found here. You want the Hydrofoam ones. At the end of the video it says plans are on the website however I don’t see any. I plan on buying a pair and building me one of these things!
omg omg omg. I have watched this video about 10 times. I need one of these!! That thing is pretty remarkable
I cant find the plans either 
Thet reminds me of another link I posted a while back.
http://www.chiefdelphi.com/forums/showthread.php?t=30910&highlight=lawnmower
Wow, that is quite the lawnmower. I think I’d still rather have the Hydrofoam becuase it can take off on water and I spend my entire summer at a lake in a sheltered cove. (Even though with the other one you could say you were going to mow the lawn :D)