Step 1: Build an enclosure for your portable toilet. The 2.6 gallon Camco is a nice size for this.
Step 3: Using a piano hinge, install a lid with a cushion on top for a comfortable place to sit or rest your feet.
Money saving tip: Using the EZ Cool insulation leftover from your van build, cut out 3 or 4 squares to make the cushion.
Step 4: A gas strut gives the lid a nice touch. It makes it easier to open as well as a stop so the lid stays up and out of the way
Step 5: Close the lid and you now have an ottoman and an easy place to store your toilet with nobody even knowing what’s inside.
More details from this vanlifehack at http://livelikepete.com/the-van-can-a-sprinter-van-toilet-and-ottoman-in-one