Looking good... Practice makes perfect! When I did my Mustang floors I had to replace the entire passenger side including some of the toe board, but the driver's side wasn't as bad so I only cut the bad parts out and sectioned in the parts of the new panel that was necessary.
Some advice in case you are interested...w
hen welding the sections in, don't try to run a continuous bead without stopping the trigger. Trigger a spot at a time to let the puddle settle, then quickly hit the puddle with another quick trigger, and continue. Warpage isn't as much a problem on the floors as it would be on a quarter panel so you can probably do a couple of inches at a time in between machine "rest periods". I'm no expert, but I've picked up a few tricks welding on junk cars through the years!
Keep posting to keep us engaged. I haven't done anything to my project in about a month. I want to install the grill in the front surround then mount it on the car. I did install the bumper/headlight mounts but I don't think I submitted a debrief report. I may do it this weekend even though it is going to be frigid this weekend!