Here is the Sketch-up file for my open segment fixture. Not everything is there, I'm not the best at Sketch-up. But if someone is interested in building a fixture for open segment it's a start. The height of the base side boards are 2x6, I made them that high so I had room under the fixture for my stepper motor, belt and gears. So if you do not need room you can make them shorter. The base top is made from two layers of 3/4" MDF, I wanted it to be as solid as possible.
Zipped copy of Setch-up file attached
Zipped copy of Setch-up file attached