Re: Cutting a hole in the bass drum...How big, methods etc...
The factory Drum Workshop resonant head made by remo has 3 small holes about 1/2 to 3/4 inch in diameter on each side near the outer edge. It sounds great. I think the sound is between a non-ported and ported head. The air is escaping out of 6 places instead of one so it has good resonance. Cutting 6 small holes my be labor intensive but maybe it's worth a try.
6 PC DW in Ruby Glass
Pearl Demon Chain
Zildjian & Sabian
Porter & Davies