My "travel" display pc is a Cooltek C1 aluminum case to contain weight(2kg), x99 gygabyte mATX board, 16gb DDR4, 2 ssd 2.5" for watchout and a m.2 one for os, intel 5820k and a gtx970 with 4gb memory, an internal declink duo pro sdi/hdmi and a magewell usb3 acquisition card.
It fits perfectly in a 6 units Proel lightweigth trolley flying case wich carries also a 'lil 5 channells audio mixer, network switch, external usb soundcard, keyboard, mouse, cables and adapters.
All for less than 20kg so you can travel with it as a simple baggage on pretty much all the flights.