Vehicle size question

[Eclipsetech]

heres a sample

Name := Escort
Short Name := Escort
Description :=
Code := ES
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 := 1
Number of Abilities := 1
Ability 1 Type := Combat To Hit Defense Plus
Ability 1 Descr := Small size makes ship 40% harder to hit in combat.
Ability 1 Val 1 := 40
Ability 1 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 := 6
Requirement Pct Fighter Bays := 0
Requirement Pct Colony Mods := 0
Requirement Pct Cargo := 0

thats the original

Engines Per Move := 3
Requirement Max Engines := 2

those are the changes. Identical to proportions mod, and using proportions mod ai files but the comp will NEVER use that design. I started with tech maxed and that as the only hull size and it still refuses to build anything.