Robert, Thanks for the beautiful photos. That lower rack from the 14 series sure improves the loading versatility of older models. Have you ever tried starting the KitchenAid at the rinses to give a prerinse or prewash while getting the load up to temperature and then restarting it? I found it really improved the results with not quite freshly soiled loads.
The blocked holes in the top of the Jet Tower probably make for better observation during the cycle also. People in the time period of the Youngstown might not have been using plastic utensils, but they tended to eat eggs, oatmeal, Farina, Ralston, cream of wheat and rice and those foods had to be washed off the dishes before placing them in a dishwasher where they were initially exposed to such hot water because it cooked those foods onto the dishes. When we began shopping for a dishwasher in the late 50s, my mother's friends who had older dishwashers, especially those who had Youngstown and Apex machines, emphasized the importance of choosing a machine with a prerinse before the wash so that the heat sensitive foods could be loosened with somewhat cooler water before the main wash. Of course, by then, there were no modern dishwashers that held water at 180F for the initial fill, but a neighbor who had a Kenmore put breakfast plates with eggy residue in her machine ONCE without getting rid of the extra egg. As the tale made its way around the neighborhood, the egg was blown up into the glasses above the plates and almost welded to the glass by the time the cycle was complete. We did not rinse for the MobileMaid, but mom did wipe the egg off the plate with a paper napkin as she loaded the machine.
In case anyone was wondering about the collar around the Hotpoint's impeller, the theory was that during the washing and rinsing the water level was high enough that the finer screen at the top kept food particles (floaters) from being recirculated and kept stray hard objects away from the edge of the impeller. When the motor stopped and the machine drained, the large holes at the bottom of the collar allowed stuff to go down the drain. The machine fills from an overhead spray and the cycle starts with a flush period of the water raining down over the dishes with the drain open so that helped warm the dishes and carry away some of the more easily removed soil before the first wash. Hotpoint had some smart people working on their dishwashers.
Robert, You did not do any sound insulating of the HP? They can really benefit from that.
Thanks again for sharing.