i'v already built one! mine has a twin b&s 18 hp mill up front, hydro-static drive rear. i'll post pixs if i can get them to work. anybody that wants to see them [or will post them] email me an i'll send them to you.
Why waste gas just to get around the pits?? Get one of these... http://www.thatplace.net/burningman/big/amypony.jpg