Syncing Large Number of Children Transform using OnPhotonSerializeView

1. Sync transform state of root gameobject with many (200+) children
   
2. Be able to add and delete children gameobjects from under the root gameobject and sync their states
   

public void OnPhotonSerializeView(PhotonStream stream, PhotonMessageInfo info) {
		if (stream.isWriting) {
			for (int i = 0; i < childrenTransforms.Length; i++) {
				if (childrenTransforms[i] != null) {
					stream.SendNext(childrenTransforms[i].localPosition);
					stream.SendNext(childrenTransforms[i].localRotation);
					stream.SendNext(childrenTransforms[i].localScale);
				}
			}
		} else {
			for (int i = 0; i < childrenTransforms.Length; i++) {
				if (childrenTransforms[i] != null) {
					childrenTransforms[i].localPosition = (Vector3)stream.ReceiveNext();
					childrenTransforms[i].localRotation = (Quaternion)stream.ReceiveNext();
					childrenTransforms[i].localScale = (Vector3)stream.ReceiveNext();
				}
			}
		}
	}
}

1. Does this seem like the right approach to handle syncing of large gameobject transform hierarchies?
   
2. If the root gameobjects transform changes, does that send update message for all of it's children?
   
3. This currently works fine with small transform hierarchies but I've tested with very large ones and I get numerous InvalidCastExceptions on the clients listening for updates and the connection drops.