If I were shooting more video, I’d definitely look into building something like this. I have a dolly that fits the sweet video tripod, but it’s a cheapy and the wheels swivel when you need to change direction. It’s a pain to drag in a straight line for repeated takes. This looks like it would solve the problem. The only issue would be making it longer and having to figure out a way to smooth the joints.
Hat tip: Photojojo’s Tumblr