Vast quantities of caffeine and sugar, an angle grinder with a braided-wire cup brush, and a dust mask. :p I put some smaller parts in the glass bead cabinet and discovered just how easy it is to warp a panel (the real challenge was finding a straight panel to warp

). Plastic is the way to go if you're just taking the paint off.
I found large patches of that red-oxide primer from a PO's repairs, and it bonds better to the steel than to anything else. There were places the paint was blistering, just lifting off the primer.