Thank you Jim.
I set it up with a large amount of success. However, there were some issues and I have some thoughts around what was happening.
First question, is it definitely better to have the Mac (attached to DAC) as the server and the PC (different room) as a client? All I want to do on the (headless) Mac is use it as an 'endpoint' to play music, and all 'file' activities done on the client PC (tagging, playlists etc). My plan for importing is to copy the media to the NAS from the PC and let auto-import (on the server) take care of the library.
Second question, I'm not sure why but I would have to reboot the Mac to get it to play music after not using for a day or so. I suspect (with no hard evidence yet) that if I ran a 'sync' on the client the file location in the library got picked up from the client. Even though the media is only one place (NAS) the actual value in 'filename' differs between MAC and PC and I suspect this maybe causing an issue.
I'm going to see if I can test this out using a cut down library (approx 30000 tracks on NAS). I'm planning on doing this partly out of my own inquisitiveness so
I can see what actually happens behind the scenes before settling on a permanent configuration.
Third question, in order to do my testing should I just ensure I have library backups of my existing 'main' library?
Again, any advice, help or thoughts gratefully received.
Paul