Update, the customer is not bent on using the same material as the main roof, so I'm open to other options.
Here's some pics of what I'm dealing with. The roof has almost no pitch at all, maybe 1" in 4' if that. It's a metal roof, or at least it used to be, with built-in gutter along the front edge. As you can see, the asphalt is completely shot. It's also pulling away where it meets the limestone, with no flashing that I can see.
The customer's main concern is to get it fixed so it will last a good long time. She is not concerned about cosmetics, since only the tenant on the 2nd floor will ever see it.
the roof measures roughly 14' x 6'
So let me ask plain and simple, what would you do? Step by step if you don't mind.