2/5 scale model tank - it's as big as a car!

[mjt60a]

Maybe not entirely off topic, this project fascinates me, I'd love one of those but really would have nowhere to run it......
Aside from that though (and this is why I give the link for part 4) I thought the transmission on this could be of use in large paddlers powered by a lawn mower or motorcycle engine....
http://youtube.com/watch?v=BWHAfaC-pPg