"Completion of a five year mission" is no more goofy than "Completion towards initial ship construction." An Enterprise that's 83% complete probably doesn't refer to a five year mission or construction. It's probably just repair project.
Completion of upgrades following
initial ship construction isn't goofy, IMHO, but thanks for returning to the secondary sub-topic.
Again, if the chart just shows the starships being repaired in orbit of Starbase 11 ("just repair projects"), how
comes the Enterprise is already 83% complete before
Stone gives the order to stop repairs on the Intrepid on behalf of Enterprise???
Captain's Log, Stardate 2947.3. We have been through a severe ion storm. One crewman is dead. Ship's damage is considerable. I have ordered a non-scheduled layover on Starbase Eleven for repairs. A full report of damages was made to the commanding officer of Starbase Eleven, Commodore Stone.
STONE: Maintenance Section 18. The section is working on the Intrepid. Reschedule. The Enterprise is on priority one. That makes three times you've read it
[the full damage report], Jim. Is there an error?
KIRK: No. But the death of the crewman.
The whole context of this episode's beginning tells us that the Enterprise
has just arrived at Starbase 11. To assume that at this point 83% of the ion storm damage have already been repaired should raise a couple of eyebrows.
Is Stone displeased with the efficiency of Maintenance Section 17 so that for the last remaining 13% he turns the repair work over to Maintenance Section 18?