Hi Ben
i have a wii u and an Xbox one. one of the great things about the wii u is that i can play most of my games on the consol controller with the screen when the rest of the family uses the large screen tv.
the idea is to make a similar controller for the Xbox one.
take a tablet with 1080p resolution, add a wireless hdmi receiver, add battery and fit the Xbox one control on the left an right of the screen to hold and play the games.
also mini jack output for the audio to headset or even speakers.
yours
Jesper