This is my SATA Molex combo box. I am not going to get into how it is wired, you will have to figure that out on your own if you want to build one. It also serves as a power adapter from SATA to Molex or Molex to SATA. I will say that I had to melt the plastic of the USB-B connector to get it to fit through the grommet. That is one reason I went with the notch in the standard box instructions. Plus this required a hole saw to be used.