What does a man do on reaching midlife? Stereo-typically, he buys a red sports car. But that was too pat for Chris Goodrich; he decided to build one instead, hoping to understand a culture generally considered unsuitable for a prep-school, Ivy League graduate. A self-confessed "auto-idiot," he was soon in over his head--but that proved part of the fun, because this immersion in auto mechanics forced Goodrich to can-front new ideas, new people,...