[Gdeaver]

First, Does your son have no hand function at all? My father had a progressive brain disease that left his body frozen. We got him an electric wheel chair the hover 'round. Its joy stick interface is extremely well implemented and could be used if there is any hand function at all. Well engineered product. I have also seen wheel chair control for people with no body function implemented with a bulb for velocity. The harder you bite, the faster you go. Turning was controlled by head movement. You look at where you want to go. There are many commercial solutions on the market that would be safer and a whole lot easier than a golf cart kludge. However, even with insurance you will have to lay out some substantial money.