That's quite awesome! Also it set my heart on fire with nostalgia for what LEGO was like back then. (That doesn't mean I prefer that, but there sure is something special about it)
Can't imagine how much fun they must have had doing that. And really, at that age, it's very impressive.
"Hinc satis elucet maiorem habere uim ad discenda ista liberam curiositatem quam meticulosam necessitatem.”
- Augustinus Hipponensis