Just after some advice... I'm having a think about tackling a model that involves some lighting work, and just want to know how much tolerance (if any) you leave for your lighting holes.
Say if I use 0.5mm fiber optic, do you use a 0.5mm drill bit, or 0.55, or even 0.6? 0.25mm cable, drill bit 0.30? 0.35?
How much leeway should you allow for?