One of the challenges with the spinner was to locate the screw holes on the forward spinner plate. After some experimenting and some research, we found success with using the ball magnets that shipped with the finish kit. I believe these are designed for the wheel pants, but they come in handy for the spinner holes too.
By taping magnets to the inside of the spinner plate over each hole, the spinner can be installed, and ball magnets can be used to locate each hole to be drilled.
This worked well enough and we drilled the holes today.