Here's the latest versions of my board. I would love to make these SMD at some time but I'm a newbie at this stuff so it will have to wait. Also these boards are to fulfill a specific need, which is strictly CAN only at the moment.
I now have two boards. A single and a double. The single is shrunk down in size a little and has protection for taking power from the bus. It still has a switchable CS pin.
The double allows you to split a CAN bus. It has two separate CAN circuits, CAN 1 uses D10 and CAN 2 uses D9 as CS. You can use either of the CAN circuits individually, or together either with separate cables or a single cable plugged in to CAN 1. (Providing it's correctly configured of course!)