A Chinese channel on Youtube decided to answer that question and shared two videos detailing the interior and exterior of this fantastic car.
Since I am the kind of person who thinks most new cars looks pretty much the same and can be described in one single word: boring (unless we are talking supercars like this one). I must say that I prefer the 1974 CX, however, I also prefer this version of the C5 X compared to the regular one.
The most obvious thing they had to change to get that retro-futuristic look was the ground clearance. This was done by adding aftermarket air suspension to the C5 X. And then of course partly covering the rear wheels.
The videos:
