Yeah, most of the results I got from searches where people trying to do engine swaps between older and new vehicles.
See the pics in this thread for a idea about want I'm hoping to do:
https://www.subaru-svx.net/forum/showthread.php?t=64744
Basically I would like to have a modern (e.g. Tesla style, or other modern car) dashboard / onboard-computer. The "CAN bus or not" question is about how I will have the SVX talk to modern computer components (getting vehicle speed, engine speed, CEL codes, etc).
Cheers,
Ian.