Fighter Missiles and such

Hi,
I would like to know what you think:
Super heavy fighters:
	These fighters act as if level 2 screens screen them.
		Cost: 4 Eff: 3
Ultra heavy fighters:
	Level 3 screens screen these fighters.
		Cost: 6 	Eff: 4
Mega heavy fighters:
	These fighters act as if they had level 4 screens, that is they
can't be
damaged by any beam weapons on a modified roll of less than 6.
		Cost: 8 Eff: 5
Advanced propulsion:
	For those who want more variation with there fighter's speed and
endurance.
		Cost: (((Endurance+1)/2)*(Speed/6))-3
		Eff: ((Endurance+1)/2)+(Speed/6)-3
	Example:
		A person is designing an ultra long range SWAC
(Endurance 11, speed 6)
		Cost:	(((11+1)/2)*(6/6))-3
			(((12/2)*(1))-3
			(6*1)-3
			6-3
			3
		Eff:	((11+1)/2)+(6/6)-3
			(6+1)-3
			4
Internal fighter weapons:
	For those of you who want lots of firepower:
	Cost:		((average damage)*3-1.25)*(Range/6)
	Eff:	((average damage)*2-1.5)*(Range/6)
	
	Example:
		The NAC scientific community has come up with a missile
that can lock onto
enemy fighters, it has 66% chance of killing a fighter, it has a range
of 9
MU.
		Cost	1
		Eff	0
Bye
Stephen