If you start going down the route of 3/4s in a 1/10th 2wd you'll manage one of two things; either you'll sit there doing backflips or turn the gearbox to dust
I'd have thought an electric 8th like your Vorza would be just the kind of thing you would want, although I dread to think how dangerous 4kg of car travelling at 60mph+ would be
Personally I wouldn't want to drive anything like that anywhere there was people/property, you could really injure someone/damage things if anything went wrong.