Here are photos of the completed gas mask Olifant, son of Pachydermos.
Made of veg tan leather that's been antiqued black. Hand sewn with waxed thread. Lenses are tinted acrylic. Lens frames and tusk canisters made of cold cast aluminum, steel wire and bolts. Detachable ears are copper and leather. Gauge is a sphygmomanometer. Hose is black neoprene.