hooahh3

Hi all. New to this forum and slightly new to Z's. Had an 05 350z before now onto a 76' 280z. I have a 5.3/4l60e waiting to swap in at the moment. I had planned on going full fiberglass front quarters, doors, hatch to rear quarters to drop weight and get the flares built in for a better look. But something that I just thought of is twisting. With all the steel panels replaced with fiberglass I wonder how much rigidity would be lost from the over all car vs. stock. Especially when you add a 330ish hp tourqe monster v8 in the equation. Would the car just twist like a pretzel as soon as I get on it 1 good time? Does anybody have experience with this happening or know of such? All the searches I did pulled up people installing body panels nothing after they drive the car. Thanks for any insight.