In addition to the 20mm motor size, this motor is also available in 25mm (captive or non-captive option) and 35mm diameter sizes. They can also be customized. Nippon Pulse America Inc. , 540-633 ...

Very nice project. As described in the video, for servo motor v dumb stepper, servo motor is more efficient and servo motor won’t miss steps, or at least not without being able to provide a warning.

There is no Ethernet connected stepper motor on the market, that can be used with standard cables, switches, connectors, and normal (widely used/known) communication protocols.