This video directly from the Snapmaker team seems to show a CNC job that is larger than 3.5x3.5" on an A350: https://www.youtube.com/watch?v=3azdWBRqhoc
And @Think8 appears to have confirmed that he was able to create a job larger than 3.5x3.5x2.0" on his smaller machine: CNC work area size?
I just want to be absolutely sure that this is accurate before making the investment!