In reference to your earlier question, Jacob/Lee, 30 ECM would be an ECM-3, or the third level of ECM tech.
That ship occupies what I sometimes think of as the Useless Zone (like the Twilight Zone, but less mysterious and more waste of resources), in that it is too large to make a proper FAC, frigate (at least at that tech level), or fighter, but is too small to be a destroyer, and so fails at both. If it were smaller and weaker, it would be cheap enough for you to churn out scores of them in months and use them to swarm enemies, and if it were stronger, it could hold its own in battle and be large enough to carry everything it needs, such as sufficient fuel. As it stands, you'd use resources to build a ship that isn't particularly effective at what it is supposed to do. If you want a fast EW ship, drop some engines and guns. If you want an AMM escort, beef it up.
By comparison, my Pegasus class destroyer is 2.192 times larger in terms of tonnage, yet only costs 1.863 times as much BP, meaning that it is both more effective as a whole, and more effective per BP used, with similar tech, though admittedly for a different role.
Pegasus class Missile Destroyer 16,000 tons 1121 Crew 3306.41 BP TCS 320 TH 2600 EM 900
8125 km/s Armour 5-56 Shields 30-300 Sensors 66/66/0/0 Damage Control Rating 30 PPV 15.84
Maint Life 4.87 Years MSP 1292 AFR 204% IFR 2.8% 1YR 90 5YR 1349 Max Repair 288 MSP
Magazine 571
Internal Confinement Fusion Drive E5 (26) Power 100 Fuel Use 50% Signature 100 Armour 0 Exp 5%
Fuel Capacity 610,000 Litres Range 137.3 billion km (195 days at full power)
Delta R300/12.5 Shields (12) Total Fuel Cost 150 Litres per day
CIWS-250 (8x6) Range 1000 km TS: 25000 km/s ROF 5 Base 50% To Hit
Size 4 Missile Launcher (33% Reduction) (12) Missile Size 4 Rate of Fire 400
Missile Fire Control FC141-R20 (2) Range 141.7m km Resolution 20
Mjolnir-4a (143) Speed: 30,100 km/s End: 44.3m Range: 80.1m km WH: 9 Size: 4 TH: 301 / 180 / 90
Active Search Sensor MR141-R20 (1) GPS 5760 Range 141.7m km Resolution 20
Thermal Sensor TH6-66 (1) Sensitivity 66 Detect Sig Strength 1000: 66m km
EM Detection Sensor EM6-66 (1) Sensitivity 66 Detect Sig Strength 1000: 66m km
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
Give me a bit and I'll draw up designs for a AMM ship. Actually, I've also been meaning to run Honor Harrington through the Mary Sue litmus test, just for a bit of a laugh...
ED: Here's a quick, rough design for a PD escort ship. I went with Gauss because I don't have railgun tech, and because it is better for PD. I trimmed quite a bit of engine-fat off, as a ship that will be hanging around larger vessels to keep missiles off of them doesn't need to outrun a FAC.
Wolfhound class Destroyer Escort 17,850 tons 1426 Crew 3313.5 BP TCS 357 TH 2500 EM 0
7002 km/s Armour 5-60 Shields 0-0 Sensors 66/1/0/0 Damage Control Rating 32 PPV 163.44
Maint Life 3.1 Years MSP 1392 AFR 212% IFR 3% 1YR 218 5YR 3265 Max Repair 240 MSP
Internal Confinement Fusion Drive E5 (25) Power 100 Fuel Use 50% Signature 100 Armour 0 Exp 5%
Fuel Capacity 660,000 Litres Range 133.1 billion km (220 days at full power)
Quad Gauss Cannon R3-100 Turret (6x12) Range 30,000km TS: 12000 km/s Power 0-0 RM 3 ROF 5 1 1 1 0 0 0 0 0 0 0
Fire Control S02 48-12500 (1) Max Range: 96,000 km TS: 12500 km/s 90 79 69 58 48 38 27 17 6 0
Active Search Sensor MR26-R1 (1) GPS 240 Range 26.4m km Resolution 1
Thermal Sensor TH6-66 (1) Sensitivity 66 Detect Sig Strength 1000: 66m km
This design is classed as a Military Vessel for maintenance purposes
Uh, yeah, with the M-S litmus test and Honor... I'm not going to let it affect me, but dayum. And that after ignoring ones relating to how the author views the character.