Yes @duerer I noticed you here at 8am, we all arrive at 8am ESP.
The lines you modelled I think are hydraulics for power steering, the other lines that go to the cab are probably electrical cable for a sensor or something. On your last image above they attach to the left (just in shot at the top of the image) above the round bit. The middle image of the three above are of front and rear axles and are completely different, Before this project I would have modelled one axle and duplicated it for the other, how wrong would that be. But as you can tell I’m no expert. As mentioned previously how far do you go, is it absolutely necessary??
@spikeyxxx your lines you mentioned before are the hydraulics and are positioned correctly. You probably have sensor wires some where also, a machine like this DOG will have sensors all over the place, not just the normal engine monitoring on a normal road vehicle.
I am as I said no expert, but I have worked on cars, stripped engines and that sort of stuff in my youth, so I know what I am looking at but couldn’t tell you technical terms for everything.
I think that’s what helped in modelling the engine, when I started it I was more concerned with my modelling skills than the engine itself. Knowing something about what you are modelling definitely helps. As @theluthier would agree when sculpting a human head, knowing the anatomy of a face will help enormously. I would say the same for hard surface modelling, I would say it’s not vital to know everything but the more you know how it works or what it does will improve the process and understanding of how it all fits together, especially on a project like this.