Nothing else on the car is any thinner than the '74 I had, but yeah the trunk lid almost sounds thinner, (hard to measure with the folded edges) and the sealant around the outside edge is like a modern car also. I've never owned a car this new, bar a '79 F100. I'm not complaining but the car feels very modern to me, closer to my wifes 2010 mazda minivan than my older mopars. This car is rough, I can only imagine how good it was when new.