It gets pretty cold in Eastern Washington.
Anything outside the foundation will need to be either heated or below the frost line. That could be several feet.
The basin with pump uses a discharge and a vent.
Plumbing run to the basin needs to be plumbed as it would in any home, trapped and vented as per the book.
Inspectors like to see the 2" discharge lines run to a 4" when possible; they dump water into a main line pretty quickly.
A good 4/10 hp pump will run several bathrooms. No problem adding a washer and kitchen sink if needed.