First. I thing you need some more flak guns at lower back side like you did in front lower gun.
Second. as I see the model you still have a blind spot at rear.....
you should probably move that radar pilon somewhere else (maybe between 2 lower guns given that front side is well supported by 4X3 guns) so that rear cannon can turn and face rear side dangers.....
Third. given that space is a 360 Battlefield... maybe you could take 1 of the 2ween cannons (i mean those that are placed side by side) from top (both rear and back) and place them to the sides (1 left and 1 right side) of haule so that the ship can defend from danger coming vertical cause atm as it is now it can not defend from that angles from a major threat (flaks can not cound as defence just counter measures)....... keep in mind that cannons placed at side could also cover frond and rear of ship couse of clock/counterwise rotations at Y axel.
Hoppe im not 2 l8t.... Thanks for hearing me out
Thats it if i confused you feel free to contact me.
Pc if you choose to follow third suggestion move flacks on top of the side towers so you can have better coverage and bypass barrel interfearence to flacks kill zone.