jp: Big weight first: Stock hood and brackets weighs 87#s, fiberglas autoform is 27, kevlar is 12. Doors, remove completely, install aftermarket fiberglas by autoform, reasonable cost, saves about 40#s each. Reason, door beam gaurds etc. Use original aluminum hinge and latches.
Drop 20 lbs each with racing seats. That's 200lbs, what was the objective? Forget the little stuff, like crossmembers, too little gain. Want more? Let's talk brake rotors, but $ per pound is beginning to climb now.