Cool idea, but there wouldn't be much to hardline. Your Ruck is stock, so there are more options, otherwise just coolant and PVC. Fuel has to be flexible.
It's not stock, just the color. But just like that pic and quote farther down "if it doesn't need to be there. remove it. if it needs to be there, make it beautiful. The coolant ive already decided in my head to GET hard lines of Acrylic if it can stand up to the heat. got the idea from built PCs but they don't have 50cc of pure power heating them up. Fuel line doesn't NEED to be flexible. Obviously The fuel line into the carb and those two coolant lines would need to move easy, and That fuel pump hardline system looked good. Run that into the engine/trans area and then a flex tube out. the PCV out, from the cylinder head cover could be a solid line, and the other PCV (NCV?) would need some flex, but a hardline out and in with a soft joint in-between would work. Sorry for the paragraph. When I am on adderall and working on my ruck, my brain just fills with all kinds of silliness.