This is a fantastic do-it-yourself project, inspiration for the maker in you.
The whole thing is fascinating (if you have that DIY gene) but one bit that sticks out: 2:39 in, where Scott has the epiphany to use an iPad mini instead of a small HDMI display. The length of the iPad mini is exactly the same as the width of the Mac mini. Coincidence? Intentional on Apple’s part?