I can see that is the intent....but I think the 40 plus year old sheet metal floor is just a little more structural than tin foil. It is a lot of work attaching to the sheet metal for minimal structural gain.
I keep looking across my shop at the California Flash / Modified Production car. In 1975, it ran 9.40s @ 150 mph plus. The Flash has 1-5/8" od (likely .095 wall ) chromoly round tubing connecting the rear spring hangers to the trans cross-member. Car is 45 years old and has seen it share (3 NHRA Walleys) of manual transmission hard launches (with wide sticky slicks) and brutal power shifts. Everything on the body lines up like brand new.
Simple, cheap, easy to install and the best part........ effective.