Interesting concept but a little vague - the first photo shows the drive to the front wheels with what looks like a vertical chain arrangement out of the side of the engine. The 2nd photo shows what looks like a horizontal belt drive from under the deck.
Either way - front wheel drive? Does anyone commercial have a FWD mower? I've seen FWD Toro's for sale but just thought they were a gimmic for home owners.
How could you get traction unless you lifted the rear wheels off the ground ?