Here > https://brickshelf.com/gallery/TheScooterGuy/Stud-io/InsideTour/4000025/4000025_-_2018_lego_60th_aniversary_factory_tour_set_studio.io
You can use the file as the building guide.
Nice! The Loco and Tender should come next!
As a side note, the centre wheels on the tender slides sideways so I think there shouldn't be a problem with standard or third-party curves or points.