Not his entire career, his later decline became famous due to the scope of wealth and influence that allowed him to indulge in some truly eccentric behavior, but he didn't build said wealth & influence peeing in jars.
> never built anything important (although had a shitload of failures, like the wooden airplane)
Never built anything? How about Las Vegas? Or the several companies he founded and ran successfully across wildly divergent fields? The man designed, built and flew an aircraft that broke world speed records at the time.
> inherited a lot of his initial money and revenue streams
Seriously? Do you not know Musk's family background?
Actually the more I think about it the more I think mint2's comparison was apt, Musk really is a Hughes-like figure, quite brilliant in ways, but with a powerful thirst for publicity and corresponding need to control his image. I could see his paranoid tendencies tending to dominate in the years to come, especially if his halo fully disintegrates