I've been reading a lot of raw transition threads lately. I don't see myself making their food, too worried about doing it wrong. There are no sources of commercial raw where I live.
But just for the heck of it, when I roasted a chicken on Sunday, I tore the heart into little pieces and gave it to the cats. Only one would eat it, and she devoured it. Next I cut up some of the liver, but got no takers, though the one who ate the heart thought about it for a long time before she decided it wasn't food after all.
Congratulations on Nightmare's conversion. How's he doing in the large crate? Does he show any signs of stress or wanting to get out?