While you are making a cube in unity which is transparent in gameplay, you would probably want to make it visible only in editor mode with gizmos. However, gizmos doesn’t rotate with the object transform. So you can use the following tricks to rotate the gizmos to fit your object. The code shown is to draw a cube which is totally the same as your object. By setting up the matrix of gizmos, we can transform gizmos to the local position, scale and rotation.
Gizmos.color = Color.green;
Gizmos.matrix = transform.localToWorldMatrix;