Some quick designs I knocked up using mid-level tech (any tech that has an individual cost under 20,000 rp).
All the fighter engines are using +25% power, as are the power plants. Powerplants are using the 0.2 size.
No active sensors on the fighters, a dedicated sensor fighter accompanies each wing.
At this tech level no point in investing in defences, the mass reuired will cut your speed too much.
Fighter only beam FC's get a free 4x to tracking speed so no need to increase that.
This one uses a 50% range on the firecontrol to save space, if you are willing to sacrifice some speed with a full size FC the meson has a max range of 75,000.
Tribal class Fighter 270 tons 10 Crew 57.1 BP TCS 5.4 TH 14.4 EM 0
11111 km/s Armour 1-3 Shields 0-0 Sensors 1/1/0/0 Damage Control Rating 0 PPV 3
Maint Life 0 Years MSP 0 AFR 54% IFR 0.7% 1YR 4 5YR 55 Max Repair 20 MSP
FTR Magneto-plasma Drive E750 (1) Power 60 Fuel Use 7500% Signature 14.4 Armour 0 Exp 100%
Fuel Capacity 5,000 Litres Range 0.4 billion km (11 hours at full power)
R7.5/C3 Meson Cannon (1) Range 40,000km TS: 11111 km/s Power 3-3 RM 7.5 ROF 5 1 1 1 1 0 0 0 0 0 0
Fire Control S00.5 20-5000 (FTR) (1) Max Range: 40,000 km TS: 20000 km/s 75 50 25 0 0 0 0 0 0 0
Stellarator Fusion Reactor Technology PB-1.25 (2) Total Power Output 3 Armour 0 Exp 20%
This design is classed as a Fighter for production, combat and maintenance purposes
This one uses a full size FC, along with a 75% size laser. Note that you can cut the number of power plants as the longer recharge time of the reduced size means a reduced effective capacitor.
Victory class Fighter 235 tons 7 Crew 87.1 BP TCS 4.7 TH 14.4 EM 0
12765 km/s Armour 1-3 Shields 0-0 Sensors 1/1/0/0 Damage Control Rating 0 PPV 2
Maint Life 0 Years MSP 0 AFR 47% IFR 0.7% 1YR 7 5YR 105 Max Repair 30 MSP
FTR Magneto-plasma Drive E750 (1) Power 60 Fuel Use 7500% Signature 14.4 Armour 0 Exp 100%
Fuel Capacity 5,000 Litres Range 0.5 billion km (11 hours at full power)
10cm C1 Far Ultraviolet Laser (75%) (1) Range 80,000km TS: 12765 km/s Power 3-1 RM 5 ROF 15 3 3 3 3 3 2 2 1 0 0
Fire Control S01 40-5000 (FTR) (1) Max Range: 80,000 km TS: 20000 km/s 88 75 62 50 38 25 12 0 0 0
Stellarator Fusion Reactor Technology PB-1.25 (1) Total Power Output 1.5 Armour 0 Exp 20%
This design is classed as a Fighter for production, combat and maintenance purposes
The Missile FC on this can target size 6 missiles(smallest target size) at 1,280,664km. this makes it effective for anti missile escort duty as well as sand papering larger targets.
Agincourt class Fighter 245 tons 3 Crew 65.7 BP TCS 4.9 TH 14.4 EM 0
12244 km/s Armour 1-3 Shields 0-0 Sensors 1/1/0/0 Damage Control Rating 0 PPV 2.4
Maint Life 0 Years MSP 0 AFR 49% IFR 0.7% 1YR 1 5YR 21 Max Repair 28 MSP
Magazine 16
FTR Magneto-plasma Drive E750 (1) Power 60 Fuel Use 7500% Signature 14.4 Armour 0 Exp 100%
Fuel Capacity 5,000 Litres Range 0.5 billion km (11 hours at full power)
Size 1 Box Launcher (16) Missile Size 1 Hangar Reload 7.5 minutes MF Reload 1.2 hours
Missile Fire Control FC11-R1 (1) Range 11.8m km Resolution 1
Size 1 Anti-missile Missile (16) Speed: 38,900 km/s End: 0.5m Range: 1.3m km WH: 1 Size: 1 TH: 492 / 295 / 147
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 Fighter for production, combat and maintenance purposes
and a heavy variant
Agincourt-H class Fighter 495 tons 3 Crew 87.3 BP TCS 9.9 TH 14.4 EM 0
6060 km/s Armour 1-5 Shields 0-0 Sensors 1/1/0/0 Damage Control Rating 0 PPV 7.2
Maint Life 0 Years MSP 0 AFR 99% IFR 1.4% 1YR 1 5YR 22 Max Repair 28 MSP
Magazine 48
FTR Magneto-plasma Drive E750 (1) Power 60 Fuel Use 7500% Signature 14.4 Armour 0 Exp 100%
Fuel Capacity 5,000 Litres Range 0.2 billion km (11 hours at full power)
Size 1 Box Launcher (48) Missile Size 1 Hangar Reload 7.5 minutes MF Reload 1.2 hours
Missile Fire Control FC11-R1 (1) Range 11.8m km Resolution 1
Size 1 Anti-missile Missile (48) Speed: 38,900 km/s End: 0.5m Range: 1.3m km WH: 1 Size: 1 TH: 492 / 295 / 147
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 Fighter for production, combat and maintenance purposes
For heavier anti ship missiles just swap out the appropriate number of launchers with larger ones. You shouldn't need to go larger than size 3-4 to get good anti ship missiles.