Spent a little time today researching and shopping. I've known that there is a limit to the overall CANBUS length of 66 ft but thought I should be able to stay under that. Running through some rough numbers though, I'll be right at the limit, or even over if I put the GMU 11 magnetometer in the right wing tip as planned. I don't really want to mess with alternate locations for fear of interference, and I do want to reserve the option of putting an air conditioner behind the baggage bulkhead. So the general consensus on VAF and even the RV-10 Facebook group seems to be use a GMU 22 in the wingtip. The GMU 22 uses RS-232, not the CANBUS, so it doesn't count against the overall length - probably saves 5' of CANBUS wiring, which is enough.

Lots of finalization of wiring planning in the wings and I have $1400 worth of stuff in my Steinair cart, but haven't pulled the trigger yet. The heated pitot is the big item, and then brackets and garmin connectors and wire. Wire seems cheap, but it adds up.