Thinking about installing some additional ones. Most of the hat channel looks to be salvageable. There are also a few Z-bars that appear to be too far gone.The big concern with the roll roofing is to make sure your bracing/cross members are just so. That stuff is 22 gauge, just like car parts stores sell.
Contemplating using some galvanized unistrut? I cannot find hat channel quite like this to save my life. Also thinking about using a combination of self-tapping screws and 3m panel adhesive to put the roofing down.