diff --git a/fusion_plating/fusion_plating/__manifest__.py b/fusion_plating/fusion_plating/__manifest__.py
index af07c27e..b5c25e37 100644
--- a/fusion_plating/fusion_plating/__manifest__.py
+++ b/fusion_plating/fusion_plating/__manifest__.py
@@ -5,7 +5,7 @@
 
 {
     'name': 'Fusion Plating',
-    'version': '19.0.8.4.1',
+    'version': '19.0.8.5.0',
     'category': 'Manufacturing/Plating',
     'summary': 'Core plating / metal finishing ERP: facilities, processes, tanks, baths, jobs, operators.',
     'description': """
diff --git a/fusion_plating/fusion_plating/models/fp_job_step.py b/fusion_plating/fusion_plating/models/fp_job_step.py
index 6cca637f..01f09211 100644
--- a/fusion_plating/fusion_plating/models/fp_job_step.py
+++ b/fusion_plating/fusion_plating/models/fp_job_step.py
@@ -76,6 +76,83 @@ class FpJobStep(models.Model):
     duration_actual = fields.Float(string='Actual Minutes', readonly=True)
     instructions = fields.Html(string='Step Instructions')
 
+    # ------------------------------------------------------------------
+    # Equipment + audit (Task 1.6)
+    # oven_id is deferred to a bridge module — fusion.plating.bake.oven
+    # lives in fusion_plating_shopfloor and core can't depend on it.
+    # masking_material_id is deferred — fusion.plating.masking.material
+    # does not yet exist in any installed module; will be added when
+    # the masking model lands (likely in fusion_plating_process_en
+    # or a future fusion_plating_masking module).
+    # ------------------------------------------------------------------
+    bath_id = fields.Many2one('fusion.plating.bath')
+    tank_id = fields.Many2one('fusion.plating.tank')
+    rack_id = fields.Many2one('fusion.plating.rack')
+    signoff_user_id = fields.Many2one('res.users', readonly=True)
+    facility_id = fields.Many2one(
+        'fusion.plating.facility',
+        related='work_centre_id.facility_id',
+        store=True,
+    )
+
+    # ------------------------------------------------------------------
+    # Plating spec (Task 1.6)
+    # ------------------------------------------------------------------
+    thickness_target = fields.Float(string='Target Thickness')
+    thickness_uom = fields.Selection(
+        [('um', 'µm'), ('mil', 'mil'), ('inch', 'in')],
+        default='um',
+    )
+    dwell_time_minutes = fields.Float()
+    bake_setpoint_temp = fields.Float(string='Bake Setpoint °C')
+    bake_actual_duration = fields.Float(string='Bake Actual Minutes')
+    bake_chart_recorder_ref = fields.Char(string='Bake Chart Recorder Ref')
+
+    # ------------------------------------------------------------------
+    # Recipe-related (Task 1.6)
+    # ------------------------------------------------------------------
+    requires_signoff = fields.Boolean(
+        related='recipe_node_id.requires_signoff',
+        store=True,
+    )
+    auto_complete = fields.Boolean(
+        related='recipe_node_id.auto_complete',
+        store=True,
+    )
+    is_manual = fields.Boolean(
+        related='recipe_node_id.is_manual',
+        store=True,
+    )
+    customer_visible = fields.Boolean(
+        related='recipe_node_id.customer_visible',
+        store=True,
+    )
+
+    # ------------------------------------------------------------------
+    # Cost rollup (Task 1.6)
+    # cost_per_hour comes from fp.work.centre (Task 1.2 added it there).
+    # cost_total recomputes when duration_actual or rate changes —
+    # duration_actual will be sum of timelog rows once Task 1.7 lands.
+    # ------------------------------------------------------------------
+    cost_per_hour = fields.Monetary(
+        related='work_centre_id.cost_per_hour',
+        currency_field='currency_id',
+    )
+    cost_total = fields.Monetary(
+        compute='_compute_cost_total',
+        store=True,
+        currency_field='currency_id',
+    )
+    currency_id = fields.Many2one(
+        'res.currency',
+        related='work_centre_id.currency_id',
+    )
+
+    @api.depends('duration_actual', 'cost_per_hour')
+    def _compute_cost_total(self):
+        for step in self:
+            step.cost_total = (step.duration_actual / 60.0) * step.cost_per_hour
+
     # ------------------------------------------------------------------
     # State machine — actions
     # ------------------------------------------------------------------
diff --git a/fusion_plating/fusion_plating/tests/test_fp_job_step_state_machine.py b/fusion_plating/fusion_plating/tests/test_fp_job_step_state_machine.py
index 60ec2ac6..3169641c 100644
--- a/fusion_plating/fusion_plating/tests/test_fp_job_step_state_machine.py
+++ b/fusion_plating/fusion_plating/tests/test_fp_job_step_state_machine.py
@@ -71,3 +71,35 @@ class TestFpJobStepStateMachine(TransactionCase):
         self.job.invalidate_recordset(['step_done_count', 'step_progress_pct'])
         self.assertEqual(self.job.step_done_count, 1)
         self.assertAlmostEqual(self.job.step_progress_pct, 33.33, places=1)
+
+    def test_facility_id_related_from_work_centre(self):
+        # Work centre with a facility -> step inherits via related field.
+        facility = self.env['fusion.plating.facility'].create({
+            'name': 'Test Facility',
+            'code': 'TFAC',
+        })
+        wc = self.env['fp.work.centre'].create({
+            'name': 'WC2', 'code': 'WC2', 'kind': 'wet_line',
+            'facility_id': facility.id,
+        })
+        step = self._make_step(work_centre_id=wc.id)
+        self.assertEqual(step.facility_id, facility)
+
+    def test_thickness_uom_default(self):
+        step = self._make_step()
+        self.assertEqual(step.thickness_uom, 'um')
+
+    def test_cost_total_zero_when_no_duration(self):
+        step = self._make_step()
+        self.assertEqual(step.cost_total, 0.0)
+
+    def test_cost_total_with_duration_and_rate(self):
+        wc = self.env['fp.work.centre'].create({
+            'name': 'WC3', 'code': 'WC3', 'kind': 'wet_line',
+            'cost_per_hour': 60.0,  # $1/min
+        })
+        step = self._make_step(work_centre_id=wc.id)
+        # Force duration_actual since we don't have timelogs in 1.6
+        step.duration_actual = 30.0
+        # Recompute happens on read after a write to a depends field
+        self.assertEqual(step.cost_total, 30.0)