Hey Ross, I can't remember the pot hole diameter of the standard pots (at a guess about 7-8mm) but it is worth upgrading to better quality pots that will require drilling the holes larger. It is a very easy job, it may end up being about 9/9.5mm diameter so just get a set of drills 1-10mm size in half mm increments.
If you drill slowly from the body top side there is only a small chance of doing damage to the spalted veneer.