InventoryScreen for RPG questions

New to Unity and need a bit of help (yes I have read all the documentation on UnityGUI).

Not sure of best ways to do:

  1. Have an inventory screen show/hide (toggle) when pressing the “I” key.

  2. Have the inventory screen appear on the screen? I added it as a GUITexture and could see it fine, but is the best way to do this, or is it better to add the texture to a GUI control like a window?

Any help would be appreciated.

Ok so I think I have solved the “press i to see inv screen” issue. Can someone look at this and tell me if its the best way (C#).

    Rect windowRect = new Rect (20, 20, 400, 600);
    bool showInventory = false;
    float timeSinceLastKeyPress = 0.0f;

    //Called every tick 
    void OnGUI()
    {
        if (showInventory)
        {
            windowRect = GUI.Window(0, windowRect, WindowFunction, "Inventory");
        }
    }

    void WindowFunction(int id)
    {
        GUI.DragWindow(new Rect(0, 0, 10000, 10000));
    }

    //Called every tick
    void Update()
    {
        timeSinceLastKeyPress += Time.deltaTime;

        if (timeSinceLastKeyPress > 0.1f)
        {
            if (Input.GetKey("i"))
                showInventory = !showInventory;
            timeSinceLastKeyPress = 0.0f;
        }
    }

Still not sure if this is best way. For now I am using a GUI Window instead of an inventory texture I created.

If it works then yes.
Can you explain better how to work with GUI and inventory?