I would probbly do something like the attached if I was doing it, but just depends on what you really want to do with it. If there is no need to flatten it, then using sheet metal is not really required. There are always 2 or 3 or more ways to model something. The trick, at least in ordered modeling, is to make the model behave according to your present and future needs.
Bob Henry REH Technical Consulting Canonsburg, PA 15317