What do I need to build a backyard movie theater?

Penny is building a backyard home theater to watch movies drive-in style. Leo says that's great! She'll need three things - a screen, speakers and a projector.

They make inflatable screens, but they're a hassle to use and expensive. Getting a hard screen is just as good. Penny will need a powerful projector that can handle the "throw" of a 16'x9' screen. Epson makes some good ones both home and pro. It depends on how bright she wants it.