It is slightly different from the video as I have modified and improved it since then. Here is Jacky demonstrating it. First time she ever tried it!!
Step 1: Items needed
Small gauge wire - Radio Shack 278-1218. I found afterwards that a couple different colors helps to keep everything straight.
Step 2: Items needed
Aluminum trim - 80" (eight x 10" strips) optional but helpful
Foam padding - four 10" squares. Should be firm but slightly flexible, and an inch or so thick. I was lucky enough to acquire some gym floor padding which is carpeted on one side. Sports Authority sells workout floor squares that may work just as well.
Rip-Stop nylon (2 yards)
Various hardware (screws, drill, soldering iron, knife, saw. glue gun, staple gun)
Step 3: Make the pad base.
Hot glue four small strips of the foam to the corners at an angle. They should be about 1/2 inch thick. This provides the cushioning for when the pad compresses. Ignore the traces of padding that aren't in the corners. Those were other positions I tried but didn't work as well.
Drill a hole for the button and attach it. (The button pictured is slightly different from the one in the items step. Get a round one if you can find it.)