HI All,
As a recently joined member of the forum I have been watching this and the Traub lathe threads along with enjoying all the other MadModder projects
I have spent 34 years of my working life as a spark, instrument tech in the power generation industry,
So may I make a comment or two here?
When panels etc are full of delicate wiring and so on the hot metal from holesaws can be a source of danger / trouble

I have had a set of "Greenlee" punches for yonks and they are ideal for enlarging conduit or gland holes
A demo here,
Onsite or when there are no cables about I have often whittled a timber plug and bunged this in the hole to be enlarged and used the required holesaw rather than have to trek bck to the workshop for the alternatives, I have also used "cone cuts" and stepped drills but prefer to keep these for use in a pedestal drill as they are easily damaged in a pistol drill
Regards
John