I have no idea, what have you to offer in terms of lessons. Bring up a good point, heck I'd get one but here's my question, how fast does it go?
It really depends on set up, your in my expert Field now. That doesn't look all that fast (about 5mph by the looks of it) however with tampering of the throttle manifold control and a change of transmission gearing you could potentially get it up to 20 or so. Remember its not a automobile, its more torward a ATV quad and as is uses pretty much a lawnmower engine however i wouldn't be surprised if you could get a small automobile engine on that thing, (small liter 2-4 cylinder or vw bug engine)
however i wouldn't because then it probably wouldn't float, what you want to stick with is a horizontal shaft motor, the engine it has now is a single cylinder 196 cc and always remember cc stands for cubic centimeters (sorta like you have liters on cars). The more cylinders and Cubic centimeters you have determines how much power the engine has. You could probably and easily put a 600 cc motor on that thing and that alone would be overkill unless you reinforce the hell out of that body and put some seatbelts in. Transmission and gearing isn't all that difficult on something like that. "big gear on engine to small gear on Axel = speed, other way around and you have torq. The beauty about it is that they literally say,"go by the manual all the way, some of it, or nearly none at all, ITS YOUR CHOICE!
HOWEVER I RECOMEND STICKING TO THERE PLANS AND PART SO YOU HAVE A BASE TO WORK OFF OF