I'm just nearing completion of my first solo heavyweight project and I would catagorically say that it would have been impossible to do even with a 13 year old in tow, never mind when I was one. My robot has cost me well in excess of a grand now and it is basically rubbish. None of the motors Technobots sell are good enough for a heavy and the only way that you're gunna get something plug and play like featherweights is if you spent £500 on motors like I did and even then you can only get them in the States and shipping costs are ridiculous. To get an electric axe that self-rights a 100kg machine is really not possible for anyone who isn't really experienced in mechanical engineering. You can't just bolt one on to a motor shaft. Ever take a look inside Thor or Terrorhurtz? They are phenomenally complicated and precise. You can't just build a featherweight kit and then be ready to build, maintain and transport a heavyweight alone. I'm sorry, but I'm really trying to help. Don't start throwing money at a project that won't ever work when you could get really good at the smaller costs for a fraction of the cost.