I have a couple of nephews (4 and 6 y.o.) who have shown an interest in tools and wheeled noisemakers. Their dad is not mechanically inclined at all, and talked to me about using them as shop help this summer. Sounds like babysitting to me, but in the spirit of enabling budding young gearheads...
Their dad autocrosses occasionally; he doesn't feel he can afford to race his daily, but he has some friends in the local FF Cobra club and codrives with them. He doesn't have the money to get them started in karting, but is open to the idea. I have the money, no kids, and a sliver of mechanical inclination.
I have a bead on a pair of '70s Margay race karts with spares for well inside my annual budget for sponsoring young drivers. Package deal comes with two rolling chassis (Cheetah model, I think), two freshly built McCullough 91b reed valve 2 strokes, lots of spares (seats, pipes, tanks, clutches, etc). One was set up for enduro, wet clutch, big tank, 4 wheel brakes with bias adjustment.
What do I need to know about karting that might affect this decision? I have a good handle on the SCCA rules. Is a modern chassis so much better than a vintage chassis that I ought to spend 2-3 times as much on kiddos who might not have fun with it? Could we upgrade an old chassis to make it more competitive, or would it be a stepping stone to bigger/better/newer karts down the line?