No RA artist has unreleased stuff from the Archive on their portfolio, it would kinda spoil the surprise.
Like you said that stuff is years old, and was made as fan-art (probably what got each of us the job in the first place). The standards for the Archive as so high that none of that could just be added in, usually each room is a months long process.
to me, this begs the question - will you/are you allowed to release images of the completed and released bridges/sets on your artstation/websites at some point, to complement those already available?
As much fun as the walk-arounds are (limited by the lack of a AR/VR thingie), it would be great to see HQ pictures of the newer bridges, like the Ent-A of TVH, the Bozeman and Defiant.