Fabrication building dont want to assist factorys

I want to mod a supportbuilding, like the dronestation in supreme commander or the caretaker in zero k.
The model is a double laser tower (looks realy cool with the fab_spray).
It´s buildable with a normal fabber.
It can support constructing building, reclaim and repair.

The problem is: It cant assist a factory and the areapatrole has no effect(shoul repair).

What is wron in the code?

Code:

{
  "base_spec": "/pa/units/land/base_structure/base_structure.json",
  "display_name": "!LOC(units:fabrication_structure.message):Fabrication Structure",
  "description": "!LOC(units:missing.message):Missing.",
 
 
 
 
  "max_health": 1500,
  "build_metal_cost": 150,
  "atrophy_rate": 7.5,
  "atrophy_cool_down": 15,
  "spawn_layers": "WL_AnyHorizontalGroundOrWaterSurface",
 
 
  "unit_types": [
    "UNITTYPE_Fabber",
    "UNITTYPE_Structure",
    "UNITTYPE_Basic",
    "UNITTYPE_Land",
    "UNITTYPE_SurfaceDefense",
    "UNITTYPE_Defense",
    "UNITTYPE_FabBuild"
  ],
  "command_caps": [
    "ORDER_Patrol",
    "ORDER_Build",
    "ORDER_Reclaim",
    "ORDER_Repair",
    "ORDER_Assist",
    "ORDER_Use"
  ],
  "guard_radius": 120,
  "guard_layer": "WL_AnySurface",
  "recon": {
    "observer": {
      "items": [
        {
          "layer": "surface_and_air",
          "channel": "sight",
          "shape": "capsule",
          "radius": 130
        }
      ]
    }
  },
  "model": [
    {
      "layer": "WL_LandHorizontal",
      "filename": "/pa/units/land/laser_defense/laser_defense.papa",
      "animtree": "/pa/anim/anim_trees/defense_turret_anim_tree.json",
      "skirt_decal": "/pa/effects/specs/skirt_defense.json"
    },
    {
      "layer": "WL_WaterSurface",
      "filename": "/pa/units/sea/floating_laser/floating_laser.papa",
      "animtree": "/pa/anim/anim_trees/defense_turret_anim_tree.json"
    }
  ],
  "tools": [
    {
      "spec_id": "/pa/units/land/fabrication_structure/fabrication_structure_build_arm.json",
      "aim_bone": "bone_pitch",
      "muzzle_bone": [
        "socket_rightMuzzle",
        "socket_leftMuzzle"
      ]
    }
  ],
 
 
 
  "fx_offsets": [
    {
      "type": "build",
      "filename": "/pa/effects/specs/fab_spray.pfx",
      "bone": "socket_rightMuzzle",
      "offset": [
        0,
        -1.891,
        -0.11
      ],
      "orientation": [
        0,
        0,
        0
      ]
    },
    {
      "type": "build",
      "filename": "/pa/effects/specs/fab_spray.pfx",
      "bone": "socket_leftMuzzle",
      "offset": [
        0,
        -1.891,
        -0.11
      ],
      "orientation": [
        0,
        0,
        0
      ]
    }
  ],
 
 
 
 
 
  "events": {
    "build_complete": {
      "audio_cue": "/SE/Build_Complete/structure_small"
    },
    "fired": {
      "audio_cue": "/SE/Weapons/structure/laser_defense_double_fire",
      "effect_spec": "/pa/effects/specs/default_muzzle_flash.pfx socket_rightMuzzle /pa/effects/specs/default_muzzle_flash.pfx socket_leftMuzzle"
    },
    "died": {
      "audio_cue": "/SE/Death/structure_small",
      "effect_scale": 0.6
    }
  },
  "mesh_bounds": [
    6,
    6,
    17.2
  ],
  "TEMP_texelinfo": 10.2184,
  "area_build_separation": 18
}

First thing I would do is get rid of

Code:

,
      "muzzle_bone": [
        "socket_rightMuzzle",
        "socket_leftMuzzle"
      ]

It's unnecessary and might cause issues. Everything else looks fine as far as I can see.

It would be helpful to have a look at the build arm as well. If you haven't already, add "auto_repair": true and set a max range.

I added the autorepair. Now it autorepairs

But it still cant assist?

Code:

{"base_spec":"/pa/tools/engineer_build_arm_adv/engineer_build_arm_adv.json",

"yaw_rate":180,
"pitch_rate":180,

"pitch_range":300,
"yaw_range":300,

"auto_repair": true,

"construction_demand":{"energy":3000,"metal":80}}

The navigation code is needed to patrole and assist

Code:

    "navigation": {
    "type": "land-small",
    "acceleration": 0,
    "brake": 0,
    "move_speed": 0,
    "turn_speed": 0,
    "dodge_radius": 0,
    "dodge_multiplier": 0,
    "wobble_factor": 0,
    "wobble_speed": 0
    },