Hi baseballmark -- Welcome to the Forum! No, aluminum doesn't smell in my experience. And the interior aluminum isn't bare -- it has plasticoat just like the outer shells of current day Airstreams.
New materials will have a lot of odor that diminishes over time but I'm sure a hot day will bump up odors from materials as well as the human habitation, tanks, etc. Being shut tight during storage will increase the "Oh my!" reaction when you open the door.
Formaldehyde is only one aspect of smells in a newer Airstream, SOB (square old box trailer), or home. But some of the discussions on that topic help flesh out how to process through these issues.