I did on mine below. I also brought the blanket down the walls so the whole building is wrapped. I live in a wet climate and do not have a rusting problem. The old shop had no eves and the new one has 18" I believe. If your going to build 64' then I would recommend a 12" eve as that gives you 66' of roof or 11 3' pieces of metal. Figure out what materials your building with, then post spacing, and the material sizes your working with. With a bit of planning you can build with full sheets of material and have little to no cutting and fitting. Saves time and money.
lg
no neat sig line