The old commercial labs almost always were set up for a "dip and dunk" system. film clipped to a holder, and sometimes folded in eh middle as in Ron's Graduated cylinder method. Those machines would automatically lift the film every minute and lower it on the next station. if the development time was 5 minutes, the developing tank would have 5 stations, the next cycle "dunking" the film in stop bath. The commercial tanks were long enough to take a regular roll of 120 or perhaps 116.

If your film was relatively short, You could just make up a square wooden tank, lined with plastic and drape your film from the top. A cover would allow you to stay in the light between steps.