You will notice the 1/2 inch tunnel brace instantly. I have actually gotten momentarily stuck on dry pavement due to the wheels coming off the ground thru a small ditch/drain into a gas station. Caught me off guard the first time, chirped the tires pretty quickly, thought it had been knocked out of gear. It truly keeps the body rigid. Hope you have a ball with it.
The owner of the GM dealership in town wanted mine, came close to trading it in on a 2016 Vette, but wanted to finish the car at that time. Money wise I would have made out, but would have a payment for a car, a payment I didn't want.
Mine was a hit at the GM dealership and anybody that knew what it was, but at car shows it might as well have been a four door sedan. Unless it was running. I think your plan is to do away with the sleeper look, Mallett did a very good job of making them fit that mold appearance wise. Sound wise not so much. lol