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I have a bare S14 chassis in my shop with roof cut, subframes removed and all suspension/ fuel tank/ engine gone. I can lift the thing up with very little strain.
It's being used to make my undertray mold for the Kognition track car. Which is pushing 2,100 lbs itself right now. Don't screw with the chassis as far as removing sections of it. It is worth more if you stitch weld it. But focus on roof (70lbs if removed), doors, replace glass all around with lexan. Replace any iron knuckles for aluminum. 2,000 lb's is crazy light. But don't sacrifice strength/stiffness for weight reduction. Most of the team time attack cars dominating right now in the states are about 2,500 lb's. The carbon roof replacement was the single most significant move i did to my car. You can easily fab up aluminum tube doorframes, and bolt up carbon/kevlar doorskins. I have molds for those. But i was like you, wanting to make it as light as possible. That was until i actually stripped this new shell down to nothing, and can pick it up like a sardine can. No, better to stitch weld it. If you cut out the back, from behind the rear shock towers like some have posted... you might be saving 20 lb's of metal. But not worth it to me. Better to have more downforce and a more rigid chassis.
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