A body Front speaker location?
This is what I have done. If my car was all original and the panels were in top notch shape, I would not cut the them. I did have to cut the doors a little.
I have a plate and 6 1/2" mid-woofer. The grills are removable so I can roll down the windows. I have Polk MOMO 6x9's in the back and a 12" sub in the trunk. All powered by a 4 channel ADS amp and Profile mono amp.