That is a very complicated & complex engine to build & wasn't done by anything short of a fairly competent machinist. I spent quite awhile following all of the lines to see where they went or were hooked to. This plant looks very complete, I believe I see a water tank, eccentric driven water pump, plunger pressurized fuel tank, boiler with several supply valves, if yoh could tell us the OD of the flywheel and the size of the boiler that would give us a better idea of scale.
Good luck with you project. 😊