wow there was not a lot of room for error there, you basically had one very small area to work with, the hood lines kept you just to the right and left of the center section and the upper tie bar on the core support wouldn't let you go to any closer to the outside edge of the hood than where you placed them.
Nice job getting them in the right spot without damaging either the hood or core support in the process. You had very little margin for error.
I don't know if I would have made the lower hole a hex, sharp corners are an invitation for stress cracks, round holes from an engineering point of view IMHO always work best