I successfully printed out my pattern onto a bunch of 8.5x11 sheets of paper, taped them together and cut them out. I taped the patterns onto my bass to make sure that it all fits the way my model said it should, and so far so good. This also let me figure out exactly where I wanted to put the electrodes, MouseTrap boxes, and the Arduino on the bass itself, in places where the copper would be easily accessible, but the sensor boxes wouldn’t be in my way. I also tried to keep the boxes on the sides of the bass, to minimize their effect on the bass’s resonance. Now it’s off to a fabric store and then to track down a sewing machine.