That would be extremely easy to implement. Just make a custom package in the.... ship_goods.ini i believe? Or maybe its Goods.ini.... i can't remember

Yeah, it's in goods.ini. For the price, keep in mind that the total price listed at the shipdealer is a combination of the hull price and all the goods mounted on the ship. Currently, the Valkyrie hull costs 127,000 credits, and the shield is 30,880, making for a total of 157,880 credits. If you add 2 Hornviper Mk II's, 2 Firekiss Mk II's, and one Hornviper Turret, that adds a total of 536,730 credits to the cost of the ship (ouch). You'd want to consider, though, do you want to make the ship less expensive, or the guns less expensive, or both? Keep in mind that by lowering the sale price, you also lower the amount you'll get back if you sell the item later. The way I'm thinking you would go about doing this would be to create a copy of the original hull and a package that includes it. For instance (in DATA\EQUIPMENT\goods.ini):

[Good
nickname = rf_hull2
category = shiphull
ship = rh_fighter
price = 100000 <-originally 127000
ids_name = 12010
item_icon = Equipment\models\commodities\nn_icons\rh_fighter.3db

[Good
nickname = re_package
category = ship
hull = re_hull
addon = ge_re_engine_01, internal, 1
addon = rh_elite_power01, internal, 1
addon = ge_s_scanner_01, internal, 1
addon = ge_s_tractor_01, internal, 1
addon = shield01_mark06_hf, HpShield01, 1
addon = rh_gun01_mark04 HpWeapon01 <-weapons I added
addon = rh_gun01_mark04, HpWeapon02
addon = rh_gun02_mark04, HpWeapon03
addon = rh_gun02_mark04, HpWeapon04
addon = rh_turret01_mark03, HpTurret01
addon = LargeWhiteSpecial, HpHeadlight, 1
addon = SlowSmallYellow, HpRunningLight01, 1
addon = SlowSmallYellow, HpRunningLight02, 1
addon = SlowSmallYellow, HpRunningLight03, 1
addon = SlowSmallYellow, HpRunningLight04, 1
addon = SlowSmallYellow, HpRunningLight05, 1
addon = SlowSmallYellow, HpRunningLight06, 1
addon = contrail01, HpContrail01, 1
addon = contrail01, HpContrail02, 1
addon = DockingLightRedSmall, HpDockLight01, 1
addon = DockingLightRedSmall, HpDockLight02, 1

I have become one with my computer. It is a feeling of ecstasy...the perfect blend of logic and emotion. I have reached...Nerdvana!

Now you see, Buying a ship is 1/4 the price, equiping it is 3/4 the price

Of course, it would be cheaper if you put weapons on it that it could legally carry (these are class 9, which the fighter is not usually able to carry).

If you wanted to create add true ship packages with discount try this. Its taken from SDK weapon goods.ini, all i'm going to do is make up a shadow goods entry with reduced cost.
[Good<--missing bracket coz of the forum
nickname = rh_gun01_mark04_cheapo
equipment = rh_gun01_mark04<--keep the same
category = equipment
price = 120480<--reduce by whatever
item_icon = equipment\models\commodities\nn_icons\EQUIPICON_gun.3db
combinable = false
ids_name = 263449
ids_info = 264449
shop_archetype = equipment\models\weapons\rh_gamma_beamer.cmp
material_library = equipment\models\rh_equip.mat

[Good<--missing bracket coz of the forum
nickname = rh_gun02_mark04_cheapo
equipment = rh_gun02_mark04<--keep the same
category = equipment
price = 120480<--reduce by whatever
item_icon = equipment\models\commodities\nn_icons\EQUIPICON_gun.3db
combinable = false
ids_name = 263453
ids_info = 264453
shop_archetype = equipment\models\weapons\rh_proton_blaster.cmp
material_library = equipment\models\rh_equip.mat

[Good<--missing bracket coz of the forum
nickname = rh_turret01_mark03_cheapo
equipment = rh_turret01_mark03<--keep the same
category = equipment
price = 54810<--reduce by whatever
item_icon = equipment\models\commodities\nn_icons\EQUIPICON_turret.3db
combinable = false
ids_name = 263456
ids_info = 264456
shop_archetype = equipment\models\weapons\li_smlturret.cmp
material_library = equipment\models\li_equip.mat

Then just add them to the package:

[Good<--missing bracket coz of the forum
nickname = re_discount_package
category = ship
hull = re_hull
addon = ge_re_engine_01, internal, 1
addon = rh_elite_power01, internal, 1
addon = ge_s_scanner_01, internal, 1
addon = ge_s_tractor_01, internal, 1
addon = shield01_mark06_hf, HpShield01, 1
addon = rh_gun01_mark04_cheapo, HpWeapon01
addon = rh_gun01_mark04_cheapo, HpWeapon02
addon = rh_gun02_mark04_cheapo, HpWeapon03
addon = rh_gun02_mark04_cheapo, HpWeapon04
addon = rh_turret01_mark03_cheapo, HpTurret01
addon = LargeWhiteSpecial, HpHeadlight, 1
addon = SlowSmallYellow, HpRunningLight01, 1
addon = SlowSmallYellow, HpRunningLight02, 1
addon = SlowSmallYellow, HpRunningLight03, 1
addon = SlowSmallYellow, HpRunningLight04, 1
addon = SlowSmallYellow, HpRunningLight05, 1
addon = SlowSmallYellow, HpRunningLight06, 1
addon = contrail01, HpContrail01, 1
addon = contrail01, HpContrail02, 1
addon = DockingLightRedSmall, HpDockLight01, 1
addon = DockingLightRedSmall, HpDockLight02, 1