The droids are moving over you now, Rast- but they're not going to wait; they are moving after the southern targets. We ruled out chokepointing at the maintenance ducts earlier- they'll just wait for you up top and then you are stuck permanently.
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KAZAN COMMAND BUNKER, Start of Turn 54
Maintenance North-East
Andro (LS11): 1/57 [OGu DW PS] [FGu RI CL] (1F)
Maintenance East
Jelena (LS9) 1/69 [OGu BG] [BGu] (6F)
Outer side west corridor middle
Kazan droids (G6) x8
Rast (LS9) 3/57 [DW OGu BL] [PS SF[/i] MM 10K RI DW ES] (Targeting Rifle) (2F) (inside maintenance hatch)
Outer west-side droid entry point, south of Northwest corner
Kazan droids (G6) x3
Outer northwest corner
Kazan droids (G6) x1
Outer north-side droid entry point, east of Northwest corner
Kazan droids (G6) x1
Outer north t-junction, centre of outer northern corridor
Kazan droids (G6) x1
Outer north-side Droid entry point, west of Northeast corner
Kazan droids (G6) x3
Outer northeast corner
Kazan droids (G6) x1
Outer east-side droid entry point, north of bulkhead
Kazan droids (G6) x1
Outer east-side bulkhead (base entrance)
Clear
Outer east-side droid entry point, south of bulkhead
Clear
Outer southeast corner
Clear
Outer south-side Droid entry point, west of southeast corner
Clear
Outer south t-junction, centre of outer southern corridor
Vera (LS11) 2/38 [RF ]CL BL] (9F) [BL CL BGu CH OGu] (4F)
Outer south-side droid entry point, east of Southwest corner
Essalin (LS8): 3/59 [OGu] (6F)
Xeth (G8) 1(1PR)/58 [CC CQ ES] [CQ PS CH DW BGu] (4F) (Heavy Sonic Blaster)
Outer southwest corner
Clear
Outer west-side droid entry point, north of Southwest corner
Clear
Total droid kills: 279
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With no more incoming droids, this is literally now just a matter of clearing the board!