Edward Zarick has managed to create a 22-inch laptop which includes both Microsoft Xbox One and Sony PS4. He built it for one of his customer. It includes 22-inch Vizio display and it the size of the XBOOK DUO.
The PS4 sits on the left hand side of the unit, and the XBOX ONE is on the right side. The whole unit still only takes one power cord (must be plugged in) and only one unit can be powered on at the same time. This system took a lot of attempts and reconfiguring to make everything fit and still some things had to be compromised to make the system work, for example it was impossible to get the USB ports on the XBOX to be extended to the outside of the case. But the unit does offer Ethernet ports for both units (WiFi for both units also works) Along with HDMI Out. Switching between the units is as easy as flipping the Red switch on the back of the unit. You can not power both units at the same time, I do it this way so you dont overheat the system. There is a Smart HDMI switcher inside that automatically selects the active input, that way you do not need to worry about making sure your on the right input. Just power it on and Play!
Read more about this project here.