Bob, Yep use right angle drill bit for starter holes, then a dremel cutting bit to connect the holes, Some have fit hole saws on right angle drills in there, I had also removed the right bottom plate and ventilated it, on my '13 the bottom plate needed to stay, maybe on a '12 it doesn't. (The '13 has a filter box down on the bottom plate for crankcase ventilation that is unique to the '13's I believe.)
Kudo's to Rob's Mods and Farkles for leading me down this path, check
his how to here.