I spent one hour preparing and making the video required for prize entry. I needed a wooden rod, clamp, bracket, and a 1/4 in bolt to attach the camera, but after that all went well. I essentially shuffled the papers with my sketches around and talked about the project. Camera batteries died and now I'm just hoping that video got saved... In other developments, I checked my 7400-series component  stash and discovered that I don't have the type of latch that I will probably end up using, 74HC573. I will have to order that.