Aisling (Sorry, wanted to have a look at it some time ago, but forgot about it until now. )
Sooo...
The inner missile launchers only get the one missile through the gap. You should add at least one quarter to those modules btw.
The last railgun segment is way too large for a single reactor to power.
You should check the power-management of the outer thrusters.
Use power storage to keep the corner pd running longer.
Additional to their limited range, laser and eb projectiles get shot down by flak rather easily.
You should also check your entire door placement, quite some doors are unnecessary or placed wrong.