Here are the photos of the micro drum sampler.
Since the setup needed to be as small as possible and also work on the street, I mounted a moving-coil (exciter) directly onto the guitar instead of using a speaker (with a counter magnet attached...
Unfortunately, I actually forgot to take pictures, but I have written to the artist asking him to take a few pictures and send them to me. I will upload the pictures as soon as possible. Thank you for your patience.