Yes, i am aware of Pi-Top, and the Motorola Lapdock. what i was thinking is something with a simple, but good size HDMI screen, and a USB keyboard and trackpad. just plug any Rpi into it and away you go. IIRC, the Pi-Top uses some GPIO pins, and my experience with the Motorola Lapdock is that they can be unreliable. though perhaps that is just my experience...
~Travis
