According to FASA's Star Trek III Sourcebook Update
, the spacedock is 3800m across, a length of 4700m, a staff of 50,000, 100,000 residents and a transient population of approximately 20,000. It weighs 110,000,000 metric tonnes.
But of course that too big, it makes no sense. Form doesn't follow function. The windows and doors are too big. That's for shuttles, not for starships. They don't know what they're doing. That saucer isn't really any bigger than the one on the Enterprise.
Now let's scale the Whale Probe!