It looks like EYP to me: I'm sorry you went through this.
http://www.theveterinaryexpert.com/backyard-poultry/egg-yolk-peritonitis/
http://www.theveterinaryexpert.com/backyard-poultry/egg-yolk-peritonitis/
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Only thing I really notice is the color of the intestines and other internal organs, but it could be lighting as well. They look almost leathery?It would be good if others who are familiar with doing necropsies could have a look at your pictures and video. Ascites is pretty obvious, as are the yellow caseous masses, but I would wonder about cancer as well. @Wyorp Rock, @casportpony, @dawg53, @TwoCrows, @coach723 , or @rebrascora, do any of you see anything obvious? I have only done a handful of necropsies myself.