Cool plugin! I really like it!

Just wanted to give you a heads up. When spawning the scraptransportheli, your plugin is also mounting two additional seats xD.

This should fix it....

void OnEntitySpawned(MiniCopter mini)
        {
            if (mini == null) return;
            if (mini.ShortPrefabName != "minicopter.entity") return;
            if (mini.mountPoints.Length < 4) mini?.gameObject.AddComponent();
        }