Here are some pictures of the assembling of 16 pads:
Note the little bumps made for reading the cell letter in Braille:
Making all these pads was a very time consuming task that took me almost five hours to finish. I had no time to make mistakes, luckily just one of the 80 very thin wires broke, but I was able to identify and fix it.
I used 5 minute Epoxy for keeping everything in place. I never had used it before, but the results was satisfactory.