Yeah, the thread is long. Buried in there are schematics to make boards, offers of boards already made, and the library. I can at least help with the library portion. I maintain it and it is found at: https://github.com/collin80/due_can
There are examples in there of how to use it. It's not perfect. I really should work on it some more but I keep getting busy. Still, it has been tested to work on a variety of projects. If you have questions feel free to ask me directly or post to that super long thread. I do check it frequently.