Drillium - Drilling bike frames and parts

Ah, thanks big block. Is there a general opinion on how far to go with chain rings? And deraileurs don't have that much power going through them, right? So they could be significantly drilled?
Has anyone tried drilling modern brake levers?

And which materials can take more drilling than others? (I assume steel will stand up to more drilling than aluminium, right?)

[Also, my interest in drillium isn't actually because I think it looks cool, I'm trying to save weight.]

Try and save some money.