Yes he did. He had the axles and the rollers done by a shop, but everything else is self-made. The frame is rectangular tubing, the drive is a junked timing chain with gears. I'm not sure if he has the plans drawn. He started with an idea and then extended it based on usage tests. It was strengthened at least once and the drive setup is the third version as far as I remember. But this seems to be the final one as it works really well. If you adjust the rollers tight enough, you can even cut sheet metal.