You could build a print washer. You could also eliminate the need for one. By using an alkaline fixer, you eliminate the need for long wash times (and the need for hypo clear). I've been using Formulary TF-4 fixer for a couple of years now. They recommend a wash time of 15-25 minutes for fiber paper. I tend to give prints a long soak and then a short wash. I've seen no downside whatsoever.

Just a thought.