Complete and utter disassembly

I did that several times. It took me about a week (a full 7 days) to do one car using a spot weld cutter (actually several of them). Start with all the unbolt parts. Then top to bottom as the car is on jack stands. Keep the drill speed low, drill bit sharp, and use plenty of cutting oil. I still found I needed to use an air chisel in a few spots to pop some panels loose. I used long sleeve leather welding gloves to keep the purple hearts to a minimum. Goggles of course, and if you use any other power tools, ear protection and sometimes a face mask/filter. Extra jack stands help a lot too when you get down to the floor pan and frame rails. Glad I don't have to do that anymore! It's tons of work. I found it more economical to just cut parts off with a Sawzall back when parts cars were easier to find. Today, it may make more sense to save everything rather than sacrifice some parts to save/sell others. Pretty labor intensive to do it that way though.