Sprocket class Asteroid Defense Complex 2500 tons 230 Crew 867.2 BP TCS 50 TH 0 EM 0
Armour 17-16 Sensors 1/100 Damage Control Rating 0 PPV 24
Quad 12cm C5 Visible Light Laser Turret (1x4) Range 80,000km TS: 20000 km/s Power 16-20 RM 2 ROF 5 4 4 2 2 1 1 1 1 0 0
PDC Fire Control S06 90-20000 H70 (1) Max Range: 180,000 km TS: 20000 km/s 94 89 83 78 72 67 61 56 50 44
Gas-Cooled Fast Reactor Technology PB-1 AR-0 (5) Total Power Output 22.5 Armour 0 Exp 5%
Active Search Sensor S100-R1 (1) GPS 100 Range 1,000k km Resolution 1
This design is classed as a Planetary Defence Centre and can be pre-fabricated in 1 sections
This is an even smaller Complex, it's just a single quad barreled laser turret enough power to fire it and aiming systems, the rest of the 2500 tons is armor just to make it more annoying. Since it's a single section prefab it's very easy to make and drop on an asteroid. The plan would be to seed an inner system asteroid belt with these to delay and aggravate an enemy fleet, also because it's very heavily armored for it's size it's hard to kill. It would also work in conjunction with the 1 section missile complex I am developing, acting as an anti-missile laser defense, there will also likely be an anti-missile gauss cannon battery to go with the set for additional missile defense.
The thing with this is that all an enemy has to do is skirt your bases by 100k km and they will be fine. Later, they can stand off at a million km and throw a couple of salvos at you, the best you can do is take out 4 missiles every 5 seconds. I would suggest some way of projecting fire power, if you are producing dropships then I guess you could maybe produce a beam armed fighter?