Isn't there that old aeroclub building where you can grab a hot pie or cup of coffee as well as use the toilet?
Don't know about that one. But there is certainly nothing at Parafield that you could even loosely define as a terminal like you find at Moorabbin, Bankstown or Archerfield. The closest amenities are the toilet block about 200m from the access gate where the walls are covered in phone numbers to call for a good time.