Glass glass glass glass glass! Use a heat gun and some 1/8" lexan to mold you a replacement back glass. same with door glass if you're allowed to. That'll be a big savings. If you wanna go really crazy with it, Your subframe connectors are good, stitch weld as much of the body as you can, and gut the doors, bolt the passenger door shut, cut the inside of the door out, take out the window regulator out, latches, etc. Cut out the dash to the firewall, and put in a race-style gauge bezel on the steering column, Take out the gas tank, put in a plastic fuel cell, and on and on and on. But of course, that's if you're putting it on the anorexic diet. You shouldn't need to go that crazy to shave a mere 300lbs off the factory curb weight.
