Water and oil pipe work is fabricated from nickel silver wire.  The spark plug cable distributor is fabricated from brass, being drilled and milled to take the plug leads which are fitted in at each end, not threaded through.  The exhaust pipes are made from copper tubing that slips over the extensions of the exhaust manifolds from the engine.  They are silver soldered together and a mounting bracket added where they fit against the side of the chassis frame.