Elon Musk, the Tesla Motors investor who has freshly installed himself as the electric automaker's CEO, has explained his management coup and the company's pending layoffs in a blog post. Tesla's $47 million engineering center outside Detroit, near the automotive industry's biggest pool of technical brains? Gone. Tesla's much-anticipated Model S sedan? Delayed until the middle of 2011, at best; the company is ceasing all real activity that would lead to a car getting built. The $109,000 Roadsters customers have ordered? "I personally stand behind delivering a product that you will love," writes Musk. Musk has not yet enumerated how many of Tesla's employees will lose their jobs.