Since this was some time ago, I have given the rockets away. I usually don't keep rockets or parts of completed projects very long. But, photos are on some dvd somewhere. I'll do some searching. The set up wasn't sophisticated compared to some of the other things I've seen. I did replace all the audible stuff on the timers and altimeters with LED's. And, did some research and testing into the best configuration for the capsule parachutes; Three parachutes attached at different points on the top of the recording capsule (a cylinder with all the equipment). All three parachutes (I think they were 36") deployed from individual tubes so they wouldn't tangle. The capsule was deployed with a CO2 ejection system. Parachutes deployed from the capsule based on a trigger timer from the time of ejection. Also, putting the rockets to where I needed them and timing was a bit tricky.
Keep in mind that because I had all the data from the rockets and capsule, I knew when to listen for the sound. Interestingly, the rocket passed the sound, then when the rocket slowed, the sound passed the rocket. Also, after hearing it, it really brought home the stress our rockets go through at high velocity. Cool there were two pressure waves from the Nike Smoke.
So, I can't really say I'm the first to do this. Funny really. If you have ever launched your rocket with a video camera ahead of others breaking Mach, the sound is probably there. Wow, it's kind of wild isn't it?