When I was a kid I had a number of Lego Technic sets - they are great! Might not be proper "engineering" but still allows you to touch and build a simplified ve

When I was a kid I had a number of Lego Technic sets - they are great! Might not be proper "engineering" but still allows you to touch and build a simplified version of many real-world things, for example a car's drive shaft. http://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3Daps&field-keywords=technics+lego http://www.amazon.com/s/ref=nb_sb_noss_1?url=search-alias%3D... If he's already pretty skilled, he'll definitely be able to handle even the sets that are marked 10 years old +. I recall I had one of these when I was 6, it was a slight challenge but that was the fun part : ).