I have been working on taking real plane/tank statistics and turning them into civ-worthy numbers, they go as follows:
Land Vehicles
See below)
kg= weight in kg
mph= speed in mph
mm= bore of main gun in mm
T= number of turrets
A= thickest armoer in mm
Cost: (kg/1000)+70
Movement: mph/10
Attack: (mm/10+(T-1))+10
Attack (Howitzer): mm/10
Defense: ((mph/10+A)/10)+mm/10
Aircraft: (Unfinished)
lb: weight in lb
hp: horsepower of engines
lbt: thrust of engines in lb
km: range in km
c: cervice ceiling in ft
kph: speed in kph
mm: total bores of all guns in mm
E: number of engines
kg: weight of bombs in kg
Cost: (lb/1000+(hp+lbt)/100)+70
Range: km/200
Attack: (c/1000+kph/10+mm)/10
Defense: ((c/1000+kph/10+mm)/10)-(E-1)
Bombard: mm/20+kg/300
Damage: (mm/20+kg/300)/2
DON'T JUST COPY WHATS HERE, LOOK FOR MORE UPDATES BELOW.
Land Vehicles

kg= weight in kg
mph= speed in mph
mm= bore of main gun in mm
T= number of turrets
A= thickest armoer in mm
Cost: (kg/1000)+70
Movement: mph/10
Attack: (mm/10+(T-1))+10
Attack (Howitzer): mm/10
Defense: ((mph/10+A)/10)+mm/10
Aircraft: (Unfinished)
lb: weight in lb
hp: horsepower of engines
lbt: thrust of engines in lb
km: range in km
c: cervice ceiling in ft
kph: speed in kph
mm: total bores of all guns in mm
E: number of engines
kg: weight of bombs in kg
Cost: (lb/1000+(hp+lbt)/100)+70
Range: km/200
Attack: (c/1000+kph/10+mm)/10
Defense: ((c/1000+kph/10+mm)/10)-(E-1)
Bombard: mm/20+kg/300
Damage: (mm/20+kg/300)/2
DON'T JUST COPY WHATS HERE, LOOK FOR MORE UPDATES BELOW.