I gave it an armor rating of 10 (it took me a while to find the armor button), and I fixed the maintenance life.
I'll put the ASS on another ship as you said, and I increased the amount of launchers to 8 (and added another magazine.)
Can't seem to design a good military engine, so I'll just roll with the ones I have now.
That leaves me with this:
Augcatlos class Missile Cruiser 21,550 tons 249 Crew 2025.74 BP TCS 431 TH 1350 EM 0
3132 km/s Armour 10-68 Shields 0-0 Sensors 1/1/0/0 Damage Control Rating 2 PPV 24
Maint Life 1.08 Years MSP 1118 AFR 1857% IFR 25.8% 1YR 969 5YR 14538 Max Repair 160 MSP
Intended Deployment Time: 12 months Spare Berths 2
Magazine 626
MK1 Commercial Ion Drive (9) Power 150 Fuel Use 10.61% Signature 150 Exp 5%
Fuel Capacity 1,100,000 Litres Range 86.6 billion km (319 days at full power)
MK1 Size 3 Missile Launcher (8) Missile Size 3 Rate of Fire 25
MK1 Missile Fire Control (2) Range 162.9m km Resolution 50
Size 3 Anti-ship Missile (104) Speed: 12,000 km/s End: 243.8m Range: 175.5m km WH: 3 Size: 3 TH: 56/33/16
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 Military Vessel for maintenance purposes
E: Well apparently 10 is a WEE BIT TOO MUCH ARMOR (who could have guessed)
Maybe this does better:
Augcatlos class Missile Cruiser 15,050 tons 215 Crew 1440.44 BP TCS 301 TH 900 EM 0
2990 km/s Armour 4-54 Shields 0-0 Sensors 1/1/0/0 Damage Control Rating 2 PPV 24
Maint Life 2.38 Years MSP 2120 AFR 906% IFR 12.6% 1YR 511 5YR 7666 Max Repair 160 MSP
Intended Deployment Time: 12 months Spare Berths 3
Magazine 626
MK1 Commercial Ion Drive (6) Power 150 Fuel Use 10.61% Signature 150 Exp 5%
Fuel Capacity 1,100,000 Litres Range 124.0 billion km (479 days at full power)
MK1 Size 3 Missile Launcher (8) Missile Size 3 Rate of Fire 25
MK1 Missile Fire Control (2) Range 162.9m km Resolution 50
Size 3 Anti-ship Missile (209) Speed: 12,000 km/s End: 243.8m Range: 175.5m km WH: 3 Size: 3 TH: 56/33/16
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 Military Vessel for maintenance purposes