With the help of a course mate, Tomasz, I cut a strip of metal and put it through the roller to make it curved. I put the angle grinder to it to make it shiny.
After the loop was welded (by Tomasz) I angle grinded it it back down so that it’s flat, and to make it shiny again. In order to affix the hoop onto the stool I used bolts, making a feature of the joinery rather than trying to hide it. On a full sized model, I would use a cap on both sides, to make the join more subtle, and match it with the metal hoop a little more.