David Cook'American Idol' winner David Cook lends a hand to 'Extreme Makeover: Home Edition' this Sunday. On the show, the singer helps build a house for The Cowan family, whose 12-year-old daughter Kori suffers from a congenital blood disease.

And although Kori herself is ill, during one of her hospital stays, she raised over $35K for the American Cancer Society -- a fact that really inspired David, who lost his older brother Adam to cancer.

The former 'Idol' talked to PopEater about his experience with Ty Pennington and co., plus how good he is with a hammer and nail. "I'm probably better off with a guitar," he tells us.