[StarShadow]

It's also somewhat more realistic to have fleets that aren't all composed of your largest hull, in my opinion at least.

I was thinking, most of a ships cost comes from it's components/weapons and only a small fraction from the hull. So a small mount that reduced weapon cost as well as size/damage/etc makes sense to me, so I came up with:

Long Name := Small Ship Mount
Short Name := Small Mount
Description := Smaller sized weapon mount which decreases weapon size by 2 times. Requires a vehicle size of 400kT or less. Can only be used on Direct Fire weapons.
Code := S
Cost Percent := 25
Tonnage Percent := 50
Tonnage Structure Percent := 50
Damage Percent := 75
Supply Percent := 50
Range Modifier := 0
Weapon To Hit Modifier := 0
Vehicle Size Minimum := 150
Vehicle Size Maximum := 400
Weapon Type Requirement := Direct Fire
Vehicle Type := Ship
Number of Tech Req := 1
Tech Area Req 1 := Ship Construction
Tech Level Req 1 := 5

I also revised the advanced small hulls a bit.

Name := Advanced Escort
Short Name := Adv. Escort
Description :=
Code := AES
Primary Bitmap Name := Escort
Alternate Bitmap Name := Escort
Vehicle Type := Ship
Tonnage := 150
Cost Minerals := 150
Cost Organics := 0
Cost Radioactives := 0
Engines Per Move := 1
Number of Tech Req := 1
Tech Area Req 1 := Ship Construction
Tech Level Req 1 := 5
Number of Abilities := 6
Ability 1 Type := Combat To Hit Defense Plus
Ability 1 Descr := Small size makes ship 60% harder to hit in combat.
Ability 1 Val 1 := 60
Ability 1 Val 2 := 0
Ability 2 Type := Phased Shield Generation
Ability 2 Descr := Advanced hull design incorporates a phased energy matix.
Ability 2 Val 1 := 100
Ability 2 Val 2 := 0
Ability 3 Type := Combat To Hit Offense Plus
Ability 3 Descr := Advanced targeting system increases chance of hitting enemies by 50%
Ability 3 Val 1 := 50
Ability 3 Val 2 := 0
Ability 4 Type := Emissive Armor
Ability 4 Descr := Advanced hull design is resistant to damage.
Ability 4 Val 1 := 30
Ability 4 Val 2 := 0
Ability 5 Type := Extra Movement Generation
Ability 5 Descr := Lightweight composites enable faster movement.
Ability 5 Val 1 := 8
Ability 5 Val 2 := 0
Ability 6 Type := Supply Storage
Ability 6 Descr := Energized hull functions as extra supply storage.
Ability 6 Val 1 := 1000
Ability 6 Val 2 := 0
Requirement Must Have Bridge := True
Requirement Can Have Aux Con := True
Requirement Min Life Support := 1
Requirement Min Crew Quarters := 1
Requirement Uses Engines := True
Requirement Max Engines := 2
Requirement Pct Fighter Bays := 0
Requirement Pct Colony Mods := 0
Requirement Pct Cargo := 0

Name := Advanced Frigate
Short Name := Adv. Frigate
Description :=
Code := AFG
Primary Bitmap Name := Frigate
Alternate Bitmap Name := Frigate
Vehicle Type := Ship
Tonnage := 200
Cost Minerals := 200
Cost Organics := 0
Cost Radioactives := 0
Engines Per Move := 1
Number of Tech Req := 1
Tech Area Req 1 := Ship Construction
Tech Level Req 1 := 6
Number of Abilities := 6
Ability 1 Type := Combat To Hit Defense Plus
Ability 1 Descr := Small size makes ship 50% harder to hit in combat.
Ability 1 Val 1 := 50
Ability 1 Val 2 := 0
Ability 2 Type := Phased Shield Generation
Ability 2 Descr := Advanced hull design incorporates a phased energy matix.
Ability 2 Val 1 := 150
Ability 2 Val 2 := 0
Ability 3 Type := Combat To Hit Offense Plus
Ability 3 Descr := Advanced targeting system increases chance of hitting enemies by 50%
Ability 3 Val 1 := 50
Ability 3 Val 2 := 0
Ability 4 Type := Emissive Armor
Ability 4 Descr := Advanced hull design is resistant to damage.
Ability 4 Val 1 := 50
Ability 4 Val 2 := 0
Ability 5 Type := Extra Movement Generation
Ability 5 Descr := Lightweight composites enable faster movement.
Ability 5 Val 1 := 8
Ability 5 Val 2 := 0
Ability 6 Type := Supply Storage
Ability 6 Descr := Energized hull functions as extra supply storage.
Ability 6 Val 1 := 1500
Ability 6 Val 2 := 0
Requirement Must Have Bridge := True
Requirement Can Have Aux Con := True
Requirement Min Life Support := 1
Requirement Min Crew Quarters := 1
Requirement Uses Engines := True
Requirement Max Engines := 2
Requirement Pct Fighter Bays := 0
Requirement Pct Colony Mods := 0
Requirement Pct Cargo := 0

Name := Advanced Destroyer
Short Name := Adv. Destroyer
Description :=
Code := ADS
Primary Bitmap Name := Destroyer
Alternate Bitmap Name := Destroyer
Vehicle Type := Ship
Tonnage := 300
Cost Minerals := 300
Cost Organics := 0
Cost Radioactives := 0
Engines Per Move := 1
Number of Tech Req := 1
Tech Area Req 1 := Ship Construction
Tech Level Req 1 := 7
Number of Abilities := 6
Ability 1 Type := Combat To Hit Defense Plus
Ability 1 Descr := Small size makes ship 50% harder to hit in combat.
Ability 1 Val 1 := 50
Ability 1 Val 2 := 0
Ability 2 Type := Phased Shield Generation
Ability 2 Descr := Advanced hull design incorporates a phased energy matix.
Ability 2 Val 1 := 200
Ability 2 Val 2 := 0
Ability 3 Type := Combat To Hit Offense Plus
Ability 3 Descr := Advanced targeting system increases chance of hitting enemies by 50%
Ability 3 Val 1 := 50
Ability 3 Val 2 := 0
Ability 4 Type := Emissive Armor
Ability 4 Descr := Advanced hull design is resistant to damage.
Ability 4 Val 1 := 70
Ability 4 Val 2 := 0
Ability 5 Type := Extra Movement Generation
Ability 5 Descr := Lightweight composites enable faster movement.
Ability 5 Val 1 := 6
Ability 5 Val 2 := 0
Ability 6 Type := Supply Storage
Ability 6 Descr := Energized hull functions as extra supply storage.
Ability 6 Val 1 := 2000
Ability 6 Val 2 := 0
Requirement Must Have Bridge := True
Requirement Can Have Aux Con := True
Requirement Min Life Support := 1
Requirement Min Crew Quarters := 1
Requirement Uses Engines := True
Requirement Max Engines := 3
Requirement Pct Fighter Bays := 0
Requirement Pct Colony Mods := 0
Requirement Pct Cargo := 0

I'm just not sure that they are well balanced though, I haven't had time to do much testing. I have the advanced escort appearing when the cruiser does. The advanced frigate is availible with the battle cruiser and the advanced detroyer with the battleship. They aren't really meant to be able to go 1-on-1 with their larger counterparts.