Adding Torso Aim to 3d Model

AimingTorso.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class AimingTorso : MonoBehaviour {

	[SerializeField]
	private Transform spine;
	[SerializeField]
	private float rotationScale = 1.0f;
	[SerializeField]
    private float clampMin = -60.0f;
	[SerializeField]
    private float clampMax = 60.0f;

	private float horzMovement;
    private float prevSpineZ;

	void Awake()
    {
        prevSpineZ = spine.localEulerAngles.z;    // Save initial X rotation of spine
    }

	// Use this for initialization
	void Start () {
		
	}
	
	// Update is called once per frame
	void Update () {

		horzMovement = Input.GetAxis("Mouse Y") * rotationScale;    // Invert direction so that aiming down results look down!

	}

	void LateUpdate()
    {
		float newAngle = prevSpineZ + horzMovement;
		if (newAngle > 180.0f) newAngle = newAngle - 360.0f;
		Debug.Log(newAngle);
		newAngle = Mathf.Clamp(newAngle, clampMin, clampMax);
        spine.localRotation = Quaternion.Euler(
			spine.localEulerAngles.x,    // Calculate new x rotation by adding mouse movement and previous spine's X rotation
            spine.localEulerAngles.y,
			newAngle
        );

        prevSpineZ = spine.localEulerAngles.z;    // Update previous x rotation to current rotation
    }
}