As you have discovered, the hydraulic lines are pretty much generic in the kit...p.t.o pump to the front, underneath control valves to the hydraulic tank and whats visible on the hopper even though they designed the cover panels on the side of the hopper to be removable for display.
Here is where I am at presently..........
Got the steel air lines plumbed from the compressor to the primary and secondary air tanks, and from the air tanks back forward to the cab area. Added some fuel stain paint to the gas cap area on the fuel tank and weathered some small areas around the air lines. Attached the fuel line to the tank.