Ed,
Sorry I'm being compulsive on this, but I am trying to figure out the cleaning and fastener thing myself at the moment.
When I studied your photos in more detail, are the front bolts holding the engine cases together new stainless steel replacement fasteners, or the cleaned up original ones? If they are new stainless, where did you source them?
Also, in regards to the dishwashing detergent, you didn't mean Dawn soap did you? I would suspect that would have foamed up and expanded right out of the dishwasher (since I remember doing that as a kid, and after standing in the corner for a while, learned never to do it again!). It's just that I have heard so much about avoiding caustic dishwasher detergent on aluminum, I would hate to wash it in the wrong stuff, and find my cases etched or weakened.
It would seem like a good business opportunity, for someone to market a reliable parts-cleaning detergent specifically for dishwashers. Of course, I'm not sure our wives would be supportive. Maybe we can talk that late night Chamois guy into selling it on TV!