Elon Musk's Tesla ventilators are a thing of engineering beauty and ingenuity, 'cause he's got his workers making 'em from scratch with stuff they got lying around their factories. Tesla just posted a tutorial video of sorts, giving folks a sneak-peek at how exactly it's making the 1,000-plus ventilators it's already donated to Los Angeles ... plus more they're apparently cranking out right now. It's fascinating ... they're literally re-purposing car parts. Elon's brainiac employees give a step-by-step walk-through of the first prototype the team built to donate to ...