If there is to be a teen version of junkyard wars it would have to be simple, simple. Maybe the flying planes, the rocket episode, and maybe the coffee grinder episode. I can see that done by teens.
But I don't think it would become a big hit, because everyone loves the complicated stuff, like a dragster or something.
The teens on that show
*could possible sotter, but not weld metal.
* probably wouldn't be able to get going a gas motor. (Like stripping it from a car and applying to a chaise.)
* probably get hurt trying to find stuff in the junkyard
* wouldn't be able to calculate the advance math for some of those projects, unless they were in calculus or trig.
Plus they wouldn't meet any other requirements
http://www.junkyard-wars.com/appforms.htm