I use a couple of bits...sharp point for cutting edges or starting pilot hole for tubes then the larger carbide bid for rounding edges and boring out the final holes for the tubes. I also use 120 and 220 sanding wheels...these are very important as you can smooth out first with the 120 then go finer with the 220. Ill use my bench sander at times if i'm working with a thick faceplate. I attach my faceplates before cutting as it allows me more control of postion....I can center the best parts where i want them and cut away the rest. I ALWAYS 220 the shell prior to dipping as it helps the finish. Yes, I laq3 the INSIDE of my shell as well as it helps get a fantastic finish. I put a few pics below.....note the dipping of the shell...it's tubes are long and capped and the connector socket is sealed with aluminum tape....quick spin in laq 3 for less than a second, tap to remove drips, spin for 5 minutes then UV. Note the prepped shells are dull looking....don't worry about it as they will pop when lacquered. I threw a pic of a gold shell that shows how I center my wood....final result on right.