SkillLocator skillComponent = BodyCatalog.FindBodyPrefab("BanditBody").GetComponent<SkillLocator>();

SkillDef primaryDef = SkillDef.CreateInstance<SkillDef>();
//Set the parameters of primaryDef

SkillDef primaryShotgunDef = SkillDef.CreateInstance<SkillDef>();
//Set the parameters of primaryShotgunDef

SkillFamily.Variant[] primaryVariants = new SkillFamily.Variant[2];
primaryVariants[0].skillDef = primaryDef;
primaryVariants[0].unlockableName = "";
primaryVariants[1].skillDef = primaryShotgunDef;
primaryVariants[1].unlockableName = "";
skillComponent.primary.skillFamily.variants = primaryVariants;