Does anyone actually know the rules with running with no door trims? If you really wanteed to go lightweight you could remove the trims, back seat, passenger seat, carpet, centre console, spare tire, make up some polucarbonate windows, remove both headlights, put some steelie tires on (if they were lighter). I guess if you had to run with something on the doors you could make something out of cardboard to keep them happy.
Flat 14 for a goal anyone?