I have been working on this for the last year and a half. Assets are built with a combination of scanning, sculpting, 3dsmax, handplane baker, and substance painter. I did all of the art with the exception of help on the following parts:
Catfish body panel CAD to game model cleanup - Evan Herbert
Oil Pump low res work - Evan Herbert
Tillett Seat low and bake- Evan Herbert
Water pump low res and bake- Jared Swanson
Wrench Early Access Announcement Trailer