Next I had to enlarge it so that one size would fit all, which I accomplished by fiberglassing over the plaster with stockinette and polyester resin. The fiberglass was rough and uneven, and so I smeared Bondo™ all over it to fill in the gaps. After sanding it smooth the pink resin and whitish Bondo left a mottled look.
First with a pencil, and then with a Sharpie®, I drew out the patterns. Professor Tauruscat had a strong belief in numerology, with both seven and eleven having a strong significance to him, so I made the skull pattern with seven panels, which will be pierced by eleven holes for mounting the sensors.
Then I laid masking tape over the form, and traced my pattern lines onto the surface so that I could cut them off. The pattern piece on top will be covered with a resin central processing engine as described in the letter. After laying the individual pieces of tape down on cardstock, I will have my patterns, and can then transfer them to the leather.