ummmm. if you look at our previous discussions you will see that there is a problem with usb type c.
Only one usb type C graphic card has been announced.
The is no adapter that you can attach to current gpus so they can output to usb type c .
You CAN use a usb type c port from the motherboard but it would use display link (which isnt direct input), as opposed to dp-over-usb type c which is a bonafide dsiplay port + power cable in the shape of one usb type -c cable.
Edit:
Basically.
If you want to use usb type C.
You need to buy the revised MSI GTX 1080ti gaming x with usb type c (the current one doesnt have it)
(almost a 3 slot card which won't enter most SFF builds)
799 GBP over
+
The new Asus monitor, because it is one of the only ones that does accept dp-over usb type c.
250 GBP
So you either go for that expensive combo,
Or you stick to existing tech like the Fushilang monitors from China, or the PackPixel ipad screen that uses DP like a regular monitor and usb for power, or a DIY monitor, if you want a proper display that can show you the boot screen.