I know what you mean about real classics smelling their age (it is the crankcase breather systems on old cars, vents to air and makes everything smell oily, a catch can cures it though). I have variously owned, Cooper S, MGB Roadster, Splittie VW, 2 Lotus Cortinas (MkI & MkII), 1600E, Escort Mexico, RS1800 Escort, 3000GSI Carlton, 1992 M5, and others all of which smelled of oil and all of which I wish I still had!
Still, I recon this 250SWB replica and your Cobra could actually be classics in their own right at some point, there are probably fewer of them than the originals and they are better made! Everybody thinks mine is a real one until you tell them it is a Z3, they become even more interested then.