The booster is a very simple design that uses the Decaffeinator itself as a template. The design shown here uses a 24 oz foam cup that was chosen to give the booster a slightly different look than the fin section of the Decaffeinator. Using a Decaffeinator cup would also work (and be a little easier). These instructions are specific for the foam cup that I used and may need to be modified for the particular foam cup that you use. Read through the instructions, especially the notes at the end before you start.