Hi Ross, as I mentioned above my Son Tom was 10 for her build of my Superlight Twenty back in March of 2016. He did get quite involved with build, with some small supervision he fitted the radiator and steering rack on his own, he is capable now of left and right hand threads, and with some guidance used the torque wrench too. However like most 10 year olds his attention span is limited, so he often got bored, and was more interested in going online on the Xbox to play with his mates. This time surprisingly my daughter, who was 6 at the time, seemed to get more involved and got hands on to the build, she helped assemble the roll bar, the seats and the steering column too, if fact she got more enjoyment out of it than Tom did. Whatever it is a great experience for them, and I was asked by my children's teacher if I would do a talk and overview of why and how we built it to the rest of the class, which I really enjoyed. I still think most of Toms class buddies did not really believe we built a car, and even less that Tom and Lucy bolted a lot of it together themselves! Have fun with it!