Never take more than 1 car apart at a time. Doing 2 is to much. The bagging ideas are great. But these cars are pretty simple to put back together. I agree, PRE-FIT,PRE-FIT,PRE-FIT. nothing is more disappointing than opening a brand new shiny repop part and having not fit. This goes for factory as well. When I did my Challenger I had to cut off all the weld studs for the window trim. They were located over .100" high or low to the edge of the body. Test all the dash Functions with a Battery before you install it in the car. Drill 1/8" holes in the hinges before you take them apart so they are easy to locate. I would line up the sheet metal before disassembly so you know what you have as far as fit. Even if your replacing some of it.
good luck Doug