Notes

using UnityEngine;
using Oxide.Core.Configuration;
using System.Linq;

namespace Oxide.Plugins {

[Info("Scrap Heli Box", "Titanium/Mehmet..", "0.0.4")]
[Description("Adds Box to Scrap Transport Helicopters")]

public class ScrapHeliBox : RustPlugin {

private string prefab = "assets/prefabs/deployable/large wood storage/box.wooden.large.prefab";

#region Config
private PluginConfig config;
protected override void LoadDefaultConfig() {
Config.WriteObject(GetDefaultConfig(), true);
}

private PluginConfig GetDefaultConfig() {
return new PluginConfig
{
box = true
retro = true
};
}

private class PluginConfig {
public bool box;
}
#endregion

#region Oxide
private void Init() {
config = Config.ReadObject<PluginConfig>();
}

private void OnEntitySpawned(ScrapTransportHelicopter entity) {
if (entity == null || !config.box) return;

// defer checking to ensure storage box is loaded (loads after parent, race condition there)
timer.Once(0.1f, () => {

// check if there is already a box
foreach (var child in entity.GetComponentsInChildren<StorageContainer>(true)) {
if (child.name == prefab) return;
}

// Putting the Transport in Transport Helicopter
var box = GameManager.server?.CreateEntity(prefab, entity.transform.position) as StorageContainer;
if (box == null) return;
box.Spawn();
box.SetParent(entity);
box.transform.localPosition = new Vector3(-0.1f, 0.85f, 1.50f);
box.transform.Rotate(new Vector3(0.0f, 0.0f, 0.0f));
box.SendNetworkUpdateImmediate(true);
});

}

// drop items when entity is killed (don't want salty tears)
private void OnEntityKill(ScrapTransportHelicopter entity) {
if (entity == null) return;
foreach (var child in entity.GetComponentsInChildren<StorageContainer>(true)) {
if (child.name == prefab) {
child.DropItems();
}
}
}

#endregion
}
}