Wrap Positive Cable w/ Battery Relocation?

I'm getting ready to move my battery to the trunk using this kit from Summit.



The guy that's helping me is an electrical engineer so everything has to be done first class. He is suggesting that I run sheathing over the positive cable because it's going to be run through the interior along the driver's side floor pan. He says the vibration of the car could cause it to rub through the outer cable and that could spell catastrophe. I don't want to argue with him because he obviously knows more about this type of thing than I do, but has anyone ever heard of doing this? Is it overkill or valuable protection?