The Belter Augmentations in Interstellar Operations (pages 74-75) weren't given AToW prosthetic codes or Trait Point costs, and
my rules question about them was answered (by Cray, no less) with a "Rule 0" response ("whatever works for your game"). After significant back and forth, I'm going with:
Vacuum Resistance Package: 6S, +6 Trait Point cost (ignore damage multipliers for vacuum/hostile environments)
Aerospace Pilot Package: 6E, +8 Trait Point cost (+1 additional Piloting (on top of the +2 all Belters get), +2 Initiative, -1 Thrust Point for special maneuvers in space)
Infantry Package: 6X, +10 Trait Point cost (+1 Damage Divisor, Ignore Encumbering equipmen)
This is based on Bone and Joint Reinforcement being 4S/+4 Trait Point cost, the significant bonuses provided by the packages, the fact they are all described as at least partially genetic in nature, and the absence of penalties in the form of obvious implants or Medical Addictions.
The parenthetical notes in the list are the Totatl Warfare scale effects described in Interstellar Operations. In the absence of AToW scale descriptions, I propose the following:
Vacuum Resistance package: A character with this package can act normally when exposed to vacuum while only taking 1 point of Fatigue damage per turn (vice the 5 unaugmented characters do). Alternatively, by curling into the fetal position and meditating, this damage can be reduced to 1 point of Fatigue per hour (with no recovery possible until in a breathable atmosphere). Tranistioning from one state to the other requires one full turn, during which the character suffers 1 Fatigue point of damage and can take no other actions. This package also includes Bone and Joint Reinforcement as described in the AToW Companion, page 180. Further, if a character with the Vacuum Resistance package meditates while they still have available life support, they extend the duration of that life support by a factor of five.
Aerospace Pilot Package: A character with this package receives a +1 intiative modifier when engaged in personal zero-g combat. The character also reduces the penalty for "Attacker Jumping/Gliding/Flying" to -1 (it's as natural as walking for these characters, and leaves the -2 level for Belters in general). This package also includes Bone and Joint Reinforcement as described in the AToW Companion, page 180.
Infantry Package: At the AToW level, this package gives the equivalent of 10 BAR (total) and a strength boost that reduces crew 1E weapons to 1. Looking at the various full body myomer implants, I'm going with: +1 BOD, +1 STR, +1 RFL, and 2/3/3/2 BAR ratings that stack without penalty with worn armor, along with the ability to wield 1E crew weapons without penalty. All of the forgoing without a CHA penalty, Unattractive trait, or Medical Addiction. That's what I think merits the 10 Trait Point cost. This package also includes Bone and Joint Reinforcement as described in the AToW Companion, page 180.
EDIT: Added the extension of external life support piece to the Vacuum Resistance Package.