That is an absolutely horrific list... What in the world were his plans -- forget it, I don't even want to think about it.
I got the list from one of your links. I hesitated before posting it because all of us are already too disgusted right now.
He wanted to kill a lot of people and get away. The tools, change of clothes, and black powder all support that hypothesis. What's conspicuously missing from the list are the flex-cuffs or wire ties that we know he had.