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I don't have access to a 3D printer but I am going to try to use the main idea of this build in a Wooden box with hinges and a latch and just drill/cut out what i need to.
I'm Also changing a few things:
-7" screen
-larger battery
-few extra buttons
-Potentiometer for Volume control
-mounted USB
-HDMI splitter to plug into TV
-External HDD for extra storage
-PS2 style Thumbsticks with select buttons

one question though thats been puzzling me about the Mounted 3.5 Jack... if a head set is plugged into the jack does it inturrupt the output to the speakers and turn those off or is there something you have to do to turn those off?