Charisma: Appearance, demeanor, poignancy, 
ect.
Strength: Physical damage, load bearing, (weapon restrictions?)
Stability: Physical/mental; decreases accuracy and skill checks when low. Can decrease aiming drastically, though increase damage output (class depending)
Skill: Elevated competence and combat ability, counteracts low stability and intelligence when high. Aiming. Weapon use boosts. 
Intelligence: General competence, cohesion, mental ability to accomplish basic tasks, up to cognizance of complex thoughts.

Anyways.
Let's start with some sort of d20 base, I mean, just repurposed. Just, to try it out. I'm rolling 3d6 for this.

Charisma: 3
Strength: 14
Stability: 3
Skill: 16
Intelligence: 5

Bad amd good, but works for a Krieg.

Time for me to sleep. Feel free to criticize, suggest, try, imagine, yeaaaah. All that good stuff. Pleeeeaaaase.