I didn't find the thick edging, but found a thinner one at Home Depot. I decided upon birch - since it looks a little more like a 'bamboo' color. I think I used 2-3 packages (I bought one at a time because I didn't know how much I would need).
I did not use the card stock at the top (as directed in the above link). Instead, I made a knot, using the cord, above the light bulb/socket. Then I cut 4 smaller pieces of the edging and ironed the corners together, around and above the knot I had made in the cord. I was wary of the edging being too close to the socket/bulb - in fear of it being a fire hazard.
Next, I cut the edging into similar sized strips. I didn't want to make the strips too long, or else the weight would make the circles droop over time.
I made circles with the strips and ironed the ends together, or to the top square. I weaved the circles in and out, overlapping on another, to help create more stability, and to help decrease the chance of drooping.
I kept overlapping circles until I felt the light peeked out enough, but was not super bright.
Please excuse the cord in the background - this picture was taken before we swagged the extra cord to the ceiling.