The cool part is that your kids are interested enough in the project to actually help.

It's summer, the weather is beautiful and yet during the week in our neighborhood you never see any kids out doing anything, nadda, zip.
No bike riding, no baseball, no kite flying nothing?
I guess I am just an old fart but I spent every daylight hour outside doing somethin' when I was a whippersnapper. Used to ride my bike 10 miles one way to my buddies house 'bout every day. But that was before video games, ipods, 200 channels and big screen TV.
Go figure, eh?
John