Seriously, no sarcasm there. As long as there is some sort of underpinning to the whole thing ensuring that kids are in fact learning what they need to, this sort of structure can be really good. I know I had tons more fun, and probably learned more building houses with lego, putting together erector sets, going out camping, not to mention trips to the library and the local museum than I did most days in school. In fact, even as far as college is concerned I learned more in my internships than I ever did in a lab environment. So long as kids are doing, and there again is some guidance I think this is a great idea.