I can answer simply by saying: "no," you do not have everything you need.
Just kidding. Your serving list looks pretty complete, but I bet you'll find you'll need extra components when building the collar.
I ended up buying a new miter saw, router, clamps, and other odds and ends. lol.
So, in the process of building my keezer and, despite several attempts, I continue to find new things I need. There is seemingly no end to the expense associated with building a keezer, but, man, it sure is fun!!