Traveler and Scrod: Yes, this was PURE EVIL. Got some instant advice from Genesis during the process when I had a delimma about flushing and couldn't reach anyone. Glad it's over and I'm draining Pure Evil Part 2 now. Pascal and Naomi are coming by to take me away from what smells like a holding tank right now, for a little bit. When I get back, I'll flush, and flush, and flush. Pure Evil #2 drained out black, black, black.
Pascal says, "We need to go for a sea trial to check her out!" I agree. Fuel dock and bridge/quasi-helecoptor photos!

And a thorough flushing of the bilges after a gallon of Tide sloshing around in there.
The smell...you guys were spot on....the smell...worse than Montezuma's Revenge after a bean burrito-eating contest. This was far beyond my expectations, and I'm SO happy it's OVER. All I have left to do is flush, and flush, and flush, and flush, then mix up my DD additive/distilled water. Piece of cake.
If I NEVER have to do this again, I will NOT be disappointed. However, if I DO have to do it again...only on MY boat (not someone else's), I will....because I love this boat. For anyone else, I say this - "call your mechanic!" There are some things you will only do for yourself. This is one of them.
Cheers to a clean engine!