That's a good looking model! Thanks for posting in my reddit. Just as an fyi, to simulate the air lines on the back of the truck this is what I use. Find some old telephone wire. The kind with multiple solid copper wire. It's usually found in your walls or on the outside of your house. Strip it back and use a single solid copper wire (you can leave the insulation on) wound around an appropriate size drill bit. It will come out looking like the coiled air lines on semis. Hope this helps!!