Place the bat form on some plastic sheeting. I used a trash bag, but in hindsight, I think that a heavier plastic tarp would have worked better. After placing the bat on the plastic outline the shape of the wings with a black magic marker. The photo above shows the outline in yellow so you can see it more clearly. Make sure to give about an inch of extra space around the close hanger to make it easier to attach later.

Cut the outline from the sheet using scissors. Notice the extra space that I left to make it easier to attach in the next step.

Lay the body on top of the wings and fold the seam over the hanger. Tape in place with the electrical tape until the entire wing is sealed.