Don't know how relevant it is, but there was a scale drawing in CINEFANTASTIQUE that indicated spacedock was something like 2.9 miles high. Or maybe 2.1? Anybody have the issue in question, I think it is the one covering TWOK-TVH.
Hell, FASA made it sound like SpaceDock was as large as the Indian sub-continent, and they were supposed to have been tied-in with official studio sources at the time. I think it was an article in their "Stardate" magazine, although I can't remember which one. It had a pretty nice side view w/ different colors representing the different sections of the station.