You always see cargo containers at the ports: those giant Lego-like metal rectangles stacked on each other. But reimagine a cargo container as a home. Or a bar. Or restaurant. Imagine walking into a bar in downtown Las Vegas that used to be a cargo container. That's the idea the Downtown Project is hoping will take off with its revival project. We talk with experts about the pros and cons of using shipping containers, and with a Seattle firm that successfully converts them into homes and bars.