EVE was fun... Great "Sandbox", but too many turds.
CCP isn't likely to give you permission, but ask away. I think the possibilities are great for RP leaning mods: Amarr vs Minmatar, Gallente vs Caldari. Just making a Mod for all 4 would be a balancing nightmare not to mention trying to come up with fittings that translate into SINS. Amarr -crap shields, heavy armor but slow repairing, short range pulse or ranged beam lasers only. Minmatar -fast, so-so shields/armor, varied ac/artillery, some fighters. Gallente: slow, average armor but fast repairs, lots of fighters, blaster and railguns. Caldari: very slow, lots of missiles, some railgun/blaster ships.
Eliminate all ewar ships -unless you can convert the ewar properly and in a balanced way
Do not include T2 ships!Frigates (5 slots): 3 frigs, 1 ewar frigate/scout (see above), 1 destroyer: Colony Ship (miner ships converted or use SINS colony ship)
minmatar:
slasher (speed/close range), rifter (ranged damage), breacher (light missiles), Vigil (scout), , Thrasher (destroyer: weak shld/armor, good speed, high ranged damage, high accuracy)
amarr:
executioner (speed/close range), punisher (ranged damage, high armor), inquisitor (slow w/missiles), Crucifier (scout), Coercer (destroyer: good armor, slow, high ranged laser beam damage, high accuracy)
gallente:
atron (fast/close range), incursus (good armor, ranged damage), imicus (1 fighter wing [2 fighters], low ranged railgun damage), Mallus (scout), Catalyst (destroyer: slow, good armor, high ranged railgun damage)
caldari:
condor (fast/close range), merlin (high shields/ranged railguns), kestrel (slow, missiles, good shields), Griffin (scout), Cormorant (destroyer: average shields, extreme range railguns, high accuracy)
Cruisers (4 slots) 3 cruisers, 1 battlecruiser (any way to expand the slots for more???)
minmatar:stabber (faster with average close range AC damage, low shield/armor), rupture (slow with ranged artillery, average shield, good armor), Bellicose (slow, high damage missiles), Cyclone (battlecruiser: above average speed, high shields, high damage ranged artillery and average damage ranged missiles, gang bonus -increased speed)
amarr:omen (average speed, very good armor, close range pulse lasers), maller (high armor, ranged beam lasers), arbitrator (slow, has fighters), prophecy (high armor, above average damage ranged beam weapons, gang bonus -increased armor)
gallente:thorax (faster with average close range blasters, good armor), celestis (slower with ranged railguns and missiles), vexor (slow with light railgun damage, 2 fighter wings), brutix (battlecruiser: slower, average railgun damage, 1 fighter wing, good armor and above average repair time, gang bonus -faster armor repair)
caldari:moa (slow, high shields, long range railgun damage), caracal (slow, high shields, long range missile damage), Osprey (slow, low damage, repairs surrounding ship's shields), ferox (battlecruiser: slow, very high shields -damage resistance, long range railgun damage)
Battle/Capital ships (5 slots) 3 BS, 1 carrier, 1 dreadnaught)
minmatar:Typhoon: high speed, average armor/shields, high damage close range ac's and short range torpedo
Tempest: average speed, average armor/shields, high damage/range artillery and cruise missiles
Maelstrom: slow, high shields -rapid shield HP recharge, high damage ranged artillery
nidhoggur: average speed, shield restore -area affect, average shields, lots of fighters/bobmers, flak cannons
naglifar: planetary/structure bombardment, 1 fighter wing, extremely high damage artillery and citadel torpedos.
amarr:Armageddon: above average speed, high armor, high damage close range pulse lasers
Apocalypse: slow, high armor, high damage ranged beam lasers
Abaddon: slow, high armor -damage reduction, high damage ranged beam lasers
archon: slow as hell, high armor, armor restore -area affect, lots of fighters/bombers, flak cannons.
revelation: planetary/structure bombardment, extreme armor amount, 1 fighter wing, extremely high damage laser beam cannons
gallente:Dominix: (nos monkey) Average speed, Antimatter diminish -area affect, 8 fighters/bombers, high shields, fast antimatter recharge
Megathron: average speed, high damage close range blasters, 1 fighter wing, enhanced weapon range/accuracy.
Hyperion: slow, high damage ranged railguns, rapid armor repair
thanatos: slow, average armor -rapid repair, armor repair -area affect, loads of fighters/bombers -rapid manufacture.
moros: planetary/structure bombardment, high armor -rapid repair, 3 fighter wings, extremely high damage railguns.
caldari:Scorpion: slow, area affect target denial, average shields, low armor, low damage ranged cruise missiles
Raven: slow, long range high yeild cruise missiles, very high shields
Rokh: slow, extreme range railguns, very high shields -damage reduction, low armor
chimera: slow, high shields -damage reduction, lots of fighters/bombers, shield damage reduction -area affect
pheonix: planetary/structure bombardment, extreme shield amount -damage reduction, 1 fighter wing, extremely high damage citadel area affect torpedos
good luck, I hope they don't blind you, rip out your tongue and cut off your hands (and feet too).