Help for architecting a MinimServer solution on MacOS

[timster]

Running Minimserver on the Mac is straightforward enough, and all you need do is copy the configuration from the NAS version. If you have a copy of the library on the Mac then it will behave exactly the same as on the NAS.
For a renderer, you could try the free OpenHome player. Control point could then be Linn Kazoo. My only concern is outputting to the USB DAC and what limitations there are with that. I have a Creative XF-i HD external DAC but it is limited to 96/24.
Network arrangements - I'm not sure why you need that if the Mac is intended to be standalone?