Step 12: Act a Fool Son!
You know what to do. Just relax and let nature take its course.
Because we were just shooting photos (and not using memory intensive video) we just keep shooting till the SD cards filled up or the camera batteries ran out. The only reason not to shoot a ton of footage is to save yourself some time in the post production process, but it is always a good rule to shoot more then to shoot less. Experiment with positioning the subject at different distances to the camera rig and with leaving the shutter open for varying amounts of time. It's a good idea to preview all of your shots in the camera view finders as you are shooting so that there are no surprises once you begin editing the footage.
Light drawing is just one way to use the Ghetto Matrix. With the controller you can trigger each camera separately and play around with time lapse in 3D, record live video from all angles, use the flash to catch high-speed 180 action...
By hacking the controller cable and combining it with an A/V out cable and a usb download cable to create a system where you could preview the frame using the A/V out into a monitor (and record it) and/or connect the camera to a computer, what called tethering, so you shoot directly to the hard drive or use an automated script (or existing software) to download the contents from each camera after a photo is taken. In this way the whole process could be automated. I don't know the limitations of multiple camera tethering via USB hubs and could find little info on it, but someone out there in the internetz does. Make it so hacker.
Our next experiments will be in creating a modular rig that can be combined to create different shapes.