Thanks, Trevanian! So, the drydock was meant to be old. Funny, though I was somehow reminded of a rusty iron bed-frame, it just never registered with me it that was the intent. Well, that explains a lot.
This line of thought does have me wondering, what could
have Jefferies and the model crew accomplished for a late 60s TV production? I just recently learned that the K-7 was constructed from models originally used in an aerospace trade-show. I already knew the pods of the station were inspired by a proposed design for an "inflatable" habitat, but it was just a few months ago I learned they used the pods themselves from an exhibit. So i wonder what might they have repurposed for a spacedock?