Dart sport dart swinger quarters

If I used just the wheel well then the line going into it between the wheel well and door wouldn't line up because the dusters and sports have that line drop down. And between the wheel wells and doors the bottom couple of inches is what needs replaced on my car. That's why I figured go from the door back. At the rear of the quarter I am wondering if I could move the lowest line up till its even with the dart section and then make a filler panel below it. My trunk extensions are kinda bad were they meet the trunk floor so they will have to get fixed and modified as needed.