For the hole: Use your own measurements from where you placed the lipo charger board or use the measurements in the pictures

Using the dremel, drill the hole in the metallic grip for the usb port (it does not have to be a perfect fit, the usb port just has to fit inside the hole)

Also drill down the side of the top half of the case to fit the protruding lipo charging board and the usb port. (This hole will be hidden behind the metallic grip)

When you insert the circuit board into the case the usb port should now match the holes drilled