Reasonable upgrade, impossible to build a new one?

[Wenin]

This is what I've created so far.

Name := Capital I
Description := The seat of government and center of trade for the entire Space Empire.
Facility Group := Planetary Support
Facility Family := 55
Roman Numeral := 1
Restrictions := None
Pic Num := 720
Cost Minerals := 12000
Cost Organics := 1000000
Cost Radioactives := 12000
Number of Tech Req := 1
Tech Area Req 1 := Cargo
Tech Level Req 1 := 1
Number of Abilities := 4
Ability 1 Type := Resource Conversion
Ability 1 Descr := Government able to trade materials at a 60% loss.
Ability 1 Val 1 := 60
Ability 1 Val 2 := 0
Ability 2 Type := Supply Generation
Ability 2 Descr := The abundent merchant traffic in this sector makes it easy to resupply government ships.
Ability 2 Val 1 := 0
Ability 2 Val 2 := 0
Ability 3 Type := Combat Modifier - System
Ability 3 Descr := Fanatical defense of the government's capital will result in a 30% increase in combat accuracy and damage.
Ability 3 Val 1 := 30
Ability 3 Val 2 := 0
Ability 4 Type := Damage Modifier - System
Ability 4 Descr :=
Ability 4 Val 1 := 30
Ability 4 Val 2 := 0

The upgrades will only improve the Resource Conversion ability, but it's the Damage Modifier and Combat Modifier abilities that make it juicy and worthy of keeping. I'm trying to make home systems very defendable.

That reminds me, is there a way to make a facilty more easily destroyed when a planet is attacked?