you might be looking for kids who are on the conveyor belt of American education... what this kid is doing and what he's learned to do will likely help him in any field he chooses... i bet chooses more than two in his lifetime... he's learned how to be a life-long learner... that is far more valuable than someone who goes to school only to learn to do a job...
Oh, and about kids learning about engineering on their own..my other kid only 5, is constantly doing experiments with weight, asking me about speed, gravity, how things are made-that kind of stuff. Kids are different and I bet she will do something more technical than the older one. I’ll keep answering her questions and finding her opportunities to combine her talents and interests with what she and the world needs.