Hi @RoryF_Nortek, welcome to the forum! 
It’s always exciting when there are more tools available for people to use, and especially so when there are clear guidelines on how to integrate them. Thanks for sharing!
To anyone interested, there’s a DVL comparison table in this comment, which I recently updated to include the Nucleus1000.
One thing I’m curious about - as I understand it one of its relatively unique features is current profiling. Is your BlueOS Extension set up to log that data as it goes, or does it “just” handle the velocity/position → MAVLink conversion for now to allow vehicle position estimation?