Hi Palliser,
I'm very interested in your efforts of getting a CAN-Library working on the DUE.
I have been doing a few things with the CAN-Shield and an Arduino UNO and I know a lot about the CAN-Bus, so I will try to help you getting it done! Sad thing is: I currently have other urgent projects/assignments that i need to address first! (And i need to get a DUE as well 
)
I'm looking forward to your CAN-Bus library and I'll try to get involved, as soon as i have the time.
... Sam