Alwyn, My Good Man, there's a difference between a challenge and taking a chance that your head might explode!!
I bet Ian could have a crack at that. though. He's already into those RC steam shovels and other digging type implements as well as tanks, this would let him combine the two! What do you think, Ian? Can it be done?
When FDR coined the phrase "The Arsenal of Democracy", he was talking about Detroit. Proud to live in the 2nd most violent city in America!!