The fun part for me was putting it all in a wooden box, and trying out panel-mount components for the first time. There's a power-switch where the LED lights up when a power source is connected, so I don't leave a LiPo in it. There's a play/stop button, and a barrel jack on the back for wall power. I even used the normal pin on the jack to disconnect the battery connector when a wall source is connected, so I can't accidentally blow up a LiPo.
I also built a little servo distribution board out of veroboard. Unfortunately that was inspired by melting one of my servos after reversing power and ground -- building headers for the 3-pin connectors helped avoid that happening again.
Thanks to Andrew Hunt for the loan of the recording equipment (Canon XA25 and EV RE20), and to Zach Horsley for the inspiration.