I don't know whether they're still available, but when I was a kid we had a portable dishwasher, and I know someone who still uses (an old) one. These roll around the kitchen, have a counter -- or cutting board -- on top, and load from the top. The inlet hose/drain hose attaches to the kitchen faucet with a quick-release connector. The unit plugs in to any wall socket. Saves changing the cabinetry. Gives you a floating island counter.