Download HereI created a pin grid with a lot more pin-placement options than the one I originally saw. Each of the 3 colors (black - red - blue) contain almost 400 pin placements. Just apply it to each green, create a temporary planar for each one, and adjust them until the grid covers the surfaces where pins would be placed.
Pin Grid overlay
Pin Grid overlay
Many thanks to Danny D for providing this.
I started off with nothing and I still have most of it left!