Just thought I'd share something I've been using all summer since I re-worked it a little after the first season.
So, first of all, yes, I'm one of those guys who's using 2 GoPro's for video/stills. It's actually saved my ass once already. I had a nasty hard opening, tore the tape on my slider, and I'm certain if I had a full DSLR and CX100 type setup, I would have walked away in much more pain, or maybe worse. I'm not going to respond to any comments about the fact that I use 2 GoPro's regardless. (I have a picture to prove it as the GoPro took a still as the slammer happened and the image is all distorted, plus it's on video http://www.youtube.com/...=channel&list=UL).
Anyways, I made this in the spring and just reworked it yesterday for next season. Essentially, it's the 3D housing, the cameras are in one button mode, and one automatically films upside down. We've all seen that before. From there, I attached the accessory port to a resistor and an LED and it's been working great with it popped out the bottom. This is simply to allow me to see if the camera is on or off while wearing my helmet in any daylight condition.
Let me know what you think. If you're slightly inclined to do it yourself, I can post a diagram I made and provide some basic instructions.
Enjoy, but please excuse my boring assed narration.