All I have is a sawzall and blades are too expensive to waste if there is no profit involved. If you remove your interior panel, you can see that there is quite a bit of open space below the rear quarter glass.
But it would be for the greater common good of the ASOG Hive,

Ya sawzall blades arnt the best way (or safest way) to remove the quarter, an air nibbler/sheet metal shears or angle cut off wheel would be best. Where the hell are ya that blades are so expensive? - in my area - they are like $3.50 each for a 6" blade.
I also wanna widen the quarters on my car to fit in a wider tire/relocate the rear tires outwards a bit for a wider stance and fabricate something like a Dually Truck wheel wells, but I dont want to compromize structual strength, thats also why I wanna see whats under there, so I can determine if its safe to weld something new up. Id go to a wrecker, but Im in Ontario Canada and they dont even want you in the yard let alone ripping a car apart - for liability reasons.
Well, if ya ever get curious enough to do it, please keep me in mind, thanks bro...