Ok, so I need a robot lawn mower that works like a Roomba. Problem is, these things start from $1000. So how about an RC car that has the head of an electric line trimmer attached to it. Towed along behind it, perhaps. Head can be driven by the RC car itself or perhaps a separate motor and battery pack. What say you, clever people? Who wants to make me one? I'll gladly test drive the prototype laughing