make it a "z-rider" style (
zero turn radius) and then use the weed eater style head. that way it does the trimming, too. electric RC cars have some pretty good solid state DC motor controllers. if you set it up as an RC mower, the good radios have a usb connector, so you could control it with a laptop/pc remotely. remember one other thing, the conventional mower is made to get the yard done...