Just thinking about sectors yesterday (was flooding and couldn't leave the house).
They indeed can be mapped out in a 2d arrangemnt that makes sense with the 'majority' of listed sectors and political boundaries.
As well the Starbases, atleast to begin with were matched up with their respective sectors. But delving to far into the higer numbers soon puts that out of whack.
So the Trek production crew/writers had at least a vague idea where all the sectors are.
And the 20000+ sectors really aren't that far away; out to around 1500 ly.
Will me mapping this out soon, feedback please!
Still with SB they most likely are named as built (number) in the upper end.
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SIR SIG a Aussie TREK Narrator