After some real "quality time" with the air hammer... the rest of the trunk is out... down to the frame rails. Good news is the frame rails look really good... not even any rust pitting (just some surface rust). There seemed to be enough "gunk" on them from undercoating the car at some point in its life.
I left the front part of the door jam, and upper part in place (temporarily) to... 1: give the car some strength in the rear due to how much structure I removed.
2: give a reference for hanging the doors... should still be able to line the doors up with whats left of the door jam.
I also left the outer wheel housing in place for structural reasons and to be able to help locate the inner wheel housing. (With this much metal removed... need SOME reference points)

After the trunk, main floor and inner wheel housings are in, I will then cut these out and replace them.