This seems to be getting back to the style of Eddy's duck without wheels.
The gizmag reference has lapsed, but see
www.autobloggreen.com/2007/03/26/the-tu-fin-get-your-excercise-by-walking-on-water/
www.treehugger.com/files/2007/03/tufin_nordic_wa.php

The second reference has more photos, including one out of the water, showing the flippers.

Regards,
Roderick B Smith
Rail News Victoria Editor

I don't think I'll be buying one in a hurry Roderick, though it would make a very unusual model if someone did it at 1:6 scale or so....