Why not treat Fighters, Drones and Marines (Fighter-like objects) as weapon systems with customizable stats like other weapons? That way you can adjust the stats to reflect your own milieu.
Fighter-like objects are rated for Speed, Hits to-kill (HTK), Range, To-hit, ROF, PEN, and DMG. All Fighter-like objects have the special ability of Halves Shields.
Speed is the number of hexes that the Fighter-like objects can travel each turn, (6, 8, 10, 12, 14)
HTK is the number of damage points each of the Fighter-like objects in the group can take. (1, 2, 3)
HTK Modifier: 1 = 1.0, 2 = 1.4, 3 = 2.0
Range is the distance from their target that the Fighter-like objects may fire from. (1, 2, 3)
Range Modifier: 1 = 1.0, 2 = 1.3, 3 = 1.7
Marines can never have more than Range 1.
To-Hit is the die roll needed to hit the Fighter-like object's target (3+, 4+, 5+)
To-Hit Modifier: 3+ = 0.67, 4+ = 0.5, 5+ =0.33
ROF is the number of times each member of a Fighter-like object group may attempt to hit. (1, 2, 3)
PEN is the number of shield rolls that each hit makes (1, 2, 3)
DMG is the number of damage rolls that each successful PEN roll makes on its target. (1, 2, 3)
The ORat and DRat calculation for a group of Fighter-like objects is:
Base Number x Speed x HTK Mod x Range Mod x To-Hit Mod x (ROF + 1) x PEN x DMG
Base Numbers:
Fighter = 7.5
Drones = 3
Marines = 6
Fighters:
A standard fighter is speed 10, HTK 1, Range 1, To-hit 5+, ROF 1, PEN 1, DMG 1, Halves Shields
Or 7.5 x 10 x 1 x 1 x 0.33 x (1 + 1) x 1 x 1 = 50
A fast fighter is speed 12, HTK 1, Range 1, To-hit 5+, ROF 1, PEN 1, DMG 1, Halves Shields
Or 7.5 x 12 x 1 x 1 x 0.33 x (1 + 1) x 1 x 1 = 60
This is in line with the customized fighter rules in Starmada F.2.4
An assault fighter is speed 10, HTK 1, Range 1, To-hit 5+, ROF 2, PEN 1, DMG 1, Halves Shields
Or 7.5 x 10 x 1 x 1 x 0.33 x (2 + 1) x 1 x 1 = 75
This is very close to the customized fighter rules in Starmada F.2.1
So you could customize a flight to be speed 14, HTK 2, Range 1, To-hit 3+, ROF 2, PEN 1, DMG 1, Halves Shields
Or 7.5 x 14 x 1.4 x 1 x 0.67 x (2 + 1) x 1 x 1 = 294
That is one expensive but powerful fighter group.
Drones:
A standard Drone is speed 10, HTK 1, Range 1, To-hit 4+, ROF 1, PEN 1, DMG 1, Halves Shields
Or 3 x 10 x 1 x 1 x 0.5 x (1 + 1) x 1 x 1 = 30
A fast Drone is speed 12, HTK 1, Range 1, To-hit 4+, ROF 1, PEN 1, DMG 1, Halves Shields
Or 3 x 12 x 1 x 1 x 0.5 x (1 + 1) x 1 x 1 = 36
An assault Drone is speed 10, HTK 1, Range 1, To-hit 4+, ROF 2, PEN 1, DMG 1, Halves Shields
Or 3 x 10 x 1 x 1 x 0.5 x (2 + 1) x 1 x 1 = 45
You could customize a flight to be speed 14, HTK 2, Range 1, To-hit 3+, ROF 2, PEN 1, DMG 1, Halves Shields
Or 3 x 14 x 1.4 x 1 x 0.67 x (2 + 1) x 1 x 1 = 117.6
Again, an expensive but powerful Drone group.
Marines:
A standard Marine is speed 10, HTK 1, Range 1, To-hit 5+, ROF 1, PEN 1, DMG 1, Halves Shields
Or 6 x 10 x 1 x 1 x 0.33 x (1 + 1) x 1 x 1 = 40
If you want real fast Marines that hit well, speed 14, HTK 2, Range 1, To-hit 3+, ROF 2, PEN 1, DMG 1, Halves Shields
Or 6 x 14 x 1.4 x 1 x 0.67 x (2 + 1) x 1 x 1 = 235.2