Version 2 update: WARNING: may accidently cause you to loose some of your module pieces from this mod (i didnt check to make sure all the form ids were the same) if this occurs, open the console and type "help power 4" then search through the list for the "ARMO" pieces your missing, then type "player.additem xxxxxxxx #" (where x is the items form id and # is the number you want)

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these are undefined armor pieces that you can place in your power armor frames to give them abilites that you would ordinarily need an armor mod slot for

now you can have a jetpack AND a stealth field

all craft-able in the utility section of the chemistry station
all craft-able in the brand new "POWER ARMOR PARTS" option in the Chemistry Station

Note: to use, place in power armor frame
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current moduals: (note, some of these may require perks to make)
Independent Stealth Field Generator (works only while sneaking, and doesnt disapear when you move, similar to fo3's Chinese stealth armor)
Independent Medical Pump
Independent Jetpack (note, the model for the jetpack doesnt show up, not sure why)
*new*Independent Overdrive Servos (the extra speed it adds probally isnt the same as the normal servos, mostlikely faster)
*new*Independent Blood Cleanser (not fully tested but i think it works)
*new object* Power Armor Psychological Interpreter (adds +5 to charisma while in power armor)
*new object* Power Armor Advanced Targeting Subsystem (combines the effects of the vats matrix, targeting hud, and recon sensors)
*new object* Power Armor Nightvision Upgrade (provides night vision while sneaking or indoors, like night person perk)
*new object* Power Armor X-Cellerator (currently untested: gives a +2 to all special stats, and slows down time, you may not wish to have this equipped all the time)

Credits: for inspiration
aerysthemaddovahking - Jetpack ring
guffeh -targeting hud eyewear
skyrimlu -Stealth gear

made in alongside and to work with my other mod:
Personal Gear