I was actually looking into this the other day. Like everyone has said, it's pretty much not possible as is. However, I saw something about a (PCIe?) card which will allow the external feed to be converted and displayed on the laptop monitor. Don't know very much about it, but thought I'd at...
Plus rent for the warehouse -- not to mention AC units to cool the place. Couple in components like others have said and you're quickly approaching 75K.