I built a car once. One of those Dune buggy kit cars you may remember from the 60's in the beach party movies. It is still around by the way, I tried to buy it back some years ago but it was not for sale.Imagine that, wanting to build something instead of buying it. That's so old fashioned. Next thing I know you'll want to build something else you could buy. What are you teaching your son and what will he think of you in the years to come? Good for you.