Chances are they took one of their 125/150cc motorcycle frames and modified them(to a degree or none) to fit a gy6 drivetrain on them. There isn't a chinese clone of say a Scarabeo that I know of... gy6 bikes all have 10" or 13" wheels.
I've noticed a number of their small gas motorcycles and electric motorcycles are basically the same thing with different engines.
I still want to find one of those chongquing tomohawks to reverse engineer and modify. (edited)