If you have your heart set on a fighter/fac fleet I would recommend you go for facs like these.
The attack version. I went with Mesons because if you manage to make it to an enemy you will need to take them out fast.
Tribal class Fast Attack Craft 800 tons 88 Crew 208.8 BP TCS 16 TH 200 EM 0
12500 km/s Armour 3-7 Shields 0-0 Sensors 1/1/0/0 Damage Control Rating 1 PPV 3
Annual Failure Rate: 5% IFR: 0.1% Maint Capacity 163 MSP Max Repair 90 MSP Est Time: 7.92 Years
GB Internal Confinement Fusion Drive E50 (1) Power 200 Fuel Use 500% Signature 200 Armour 0 Exp 15%
Fuel Capacity 50,000 Litres Range 22.5 billion km (20 days at full power)
R7.5/C3 Meson Cannon (1) Range 75,000km TS: 12500 km/s Power 3-3 RM 7.5 ROF 5 1 1 1 1 1 1 1 0 0 0
Fire Control S03 40-15000 (1) Max Range: 80,000 km TS: 15000 km/s 88 75 62 50 38 25 12 0 0 0
Tokamak Fusion Reactor Technology PB-1 AR-0 (2) Total Power Output 3.2 Armour 0 Exp 5%
This design is classed as a Military Vessel for maintenance purposes
Another version, I upped the fire control speed rating to 6250 km/s from 5000 km/s, used a smaller fuel tank, and engineering space, and was able to add 4 layers of armor.
Tribal v2 class Fast Attack Craft 800 tons 76 Crew 213 BP TCS 16 TH 200 EM 0
12500 km/s Armour 7-7 Shields 0-0 Sensors 1/1/0/0 Damage Control Rating 0 PPV 3
Annual Failure Rate: 10% IFR: 0.1% Maint Capacity 83 MSP Max Repair 75 MSP Est Time: 4.16 Years
GB Internal Confinement Fusion Drive E50 (1) Power 200 Fuel Use 500% Signature 200 Armour 0 Exp 15%
Fuel Capacity 10,000 Litres Range 4.5 billion km (4 days at full power)
R7.5/C3 Meson Cannon (1) Range 75,000km TS: 12500 km/s Power 3-3 RM 7.5 ROF 5 1 1 1 1 1 1 1 0 0 0
Fire Control S02 40-12500 (1) Max Range: 80,000 km TS: 12500 km/s 88 75 62 50 38 25 12 0 0 0
Tokamak Fusion Reactor Technology PB-1 AR-0 (2) Total Power Output 3.2 Armour 0 Exp 5%
This design is classed as a Military Vessel for maintenance purposes
The scout. There is room to play with this I padded it with armor but its goal is to give your facs a point defense sensor so they can try to shoot down missiles on the long flight to the enemy.
Victory class Fast Scout Craft 800 tons 55 Crew 222.7 BP TCS 16 TH 200 EM 0
12500 km/s Armour 8-7 Shields 0-0 Sensors 1/1/0/0 Damage Control Rating 1 PPV 0
Annual Failure Rate: 5% IFR: 0.1% Maint Capacity 174 MSP Max Repair 84 MSP Est Time: 8.5 Years
GB Internal Confinement Fusion Drive E50 (1) Power 200 Fuel Use 500% Signature 200 Armour 0 Exp 15%
Fuel Capacity 50,000 Litres Range 22.5 billion km (20 days at full power)
Active Search Sensor MR11-R1 (1) GPS 84 Range 11.8m km Resolution 1
This design is classed as a Military Vessel for maintenance purposes
After making these designs I still have over 600000 rp left so there is a plenty left over and you may even be able improve them more.
As for the rest of the fleet, make a dedicated scout ship. Move your big sensors off of all the other ships and on to the scout. Passive sensor will be your friend you may not even want large active sensors.
Most of your fleet space will need to go to carriers so you have enough facs to give each other cover while flying in.
You will probably want one point defense design in case you get caught with your pants down.