I've been watching the "original" Lost in Space (1965), "rediscovering" it having only vague memories of watching it in its original run. At the start of the first broadcast episode (not referring to the unaired pilot which I haven't seen), pre-launch "news coverage" tours the Jupiter 2, showing its two decks, amenities and general interior layout. While situated on the planet in the first season, the upper deck is about a foot or so above "ground", placing the lower deck "buried" below the surrounding landscape. The upper deck has large windows, and a door, affording views into the ship from outside and outside the ship from within. Movement between decks may be accomplished by ladder or functioning elevator.
Now to my (production context) question...
Was that just one complete set - the spaceship and landscape, serving for both interiors and exteriors, or was there a second ship set (or sets) for interiors (especially for scenes "downstairs")?
Since the ship was seen to have several bedrooms as well as dining area and workspaces, was that all accommodated within a single set, or were multiple sets required (almost seems bigger on the inside)?
There are establishing shots which are pretty obviously done using miniatures and/or paintings, but in my question I am referring specifically to sets hosting acted scenes - where the actors move around the sets - going in and out of the ship, riding the elevator, entering rooms, etc..