It would probably make more sense to put this into a thick battery cover on the bottom instead. You would have to fit the camera along with an additional microphone and speaker inside and the somehow hook it up to the main device (perhaps wireless or via an external USB plug). Major downside would be that the total becomes really thick that way.
All we have to do is to make the lid thicker and add an additional cable/lines to the LCD Cable so we can fit a camera inside. But this would make the device a lot thicker the way it is now.