In this model following materials were used: Procedural Copper Shader, Scratched Paint Shader, Procedural Grungy Metal Shader from CgAlpha Fabric Materials Pack for Cycles (fabric_upholstery_8h) from elbrujodelatribu.
Thank You guys!
I placed this in one of Greg Zaal's HDR environments and am amazed at how believable it looks right off the bat.
Thank You scypert, glad to hear, that somebody uses it :D and when You get away the balloon, wings and engines and put propeller in the rear, You have a submarine (i actually started to model a submarine...)
Great job :D