Saw this at an estate sale yesterday. The drain hose was run out the back of the cabinet. I don't recall a water line and power cord, but presumably so. Something in an FSP bag attached to the side.
I remember seeing cabinets in Ikea. That one looks like something someone fabricated...I'm thinking about doing something similar or making a kitchen island and putting my Maytag in it as a portable.
Next door to me is a seasonal camp and they have a regular portable that slides under their kitchen countertop. They just removed the faux butcher block top and it has the room to slide in and look built in and easily rolls up to the sink.
The sale items were in a large workbarn behind the house which looked to have a sawdust collection system. The deceased presumably did some woodworking among other ventures & hobbies so I figure the dishwasher cabinet was made by him.