I cut out far more than I needed and, after stringing it together using a sewing machine, discovered that the mobile was twice as long as I had anticipated. But it did look so cute hanging from the ceiling during the baby shower.
I've never made one of these before so I had to kind of guess how to put it together. I found a couple of cheap quilting hoops at Hobby Lobby and used the interior frames (if anyone has a need for some exterior extendable frames, let me know. I have no idea what to do with them now.) I bought some 1/2 inch pink satin ribbon. To create the hanging apparatus, I punched some tiny holes through the wooden ring using my heavy-duty Crop-a-Dile. (I don't know for sure, but I suspect it's the only paper-crafting tool strong enough to punch a small hole through thick wood.) I took six lengths of satin ribbon and threaded each through a hole, knotting each on the outside of the hoop. I used the leftover ribbon and wound it around the outer hoop to give it a finishing touch.