True, by stripping off the armour I get space for another 2 missile batteries.
Hedgehog class Planetary Defence Centre 2,500 tons 363 Crew 393.8 BP TCS 50 TH 0 EM 0
Armour 5-16 Sensors 1/60 Damage Control Rating 0 PPV 28
Magazine 103
PDC Missile Launcher S1 RoF 5 (28) Missile Size 1 Rate of Fire 5
MFC S01 R001 MR 2,160 Ms6 235 (7) Range 2.2m km Resolution 1
Interceptor S1 AMM (103) Speed: 32,200 km/s End: 1.2m Range: 2.3m km WH: 1 Size: 1 TH: 182 / 109 / 54
ASS S05 R001 MR 3,600 Ms6 392 (1) GPS 60 Range 3.6m km Resolution 1
Missile to hit chances are vs targets moving at 3000 km/s, 5000 km/s and 10,000 km/s
This design is classed as a Planetary Defence Centre and can be pre-fabricated in 1 sections
I could strip out the magazines entirely and rely on the reloading from planetry stockpile, which would give another missile battery, but it would probably be a bad habit to get into.