I finished it! I had a successful toy-destroying session. It still makes noise and they're a bit different than the original toy. Which is much better than my first few tries and I suppose could be considered a success.

It's a combination of two toys and a bunch of scary looking wires. Plus I added the alligator clips to help with it. I don't think I was suppose to do that. They're not permanent fixtures, so they can be salvaged.