Creating a dynamic list in OnGUI

So I'm going to try to be as clear as possible here.

I have an inventory system in place currently and it's pretty simple:

 #pragma strict
 
 private var showINV : boolean = false;
 
 static var inventoryArray : int[] = [1];
 
 function Update () {
     if(Input.GetKeyDown(KeyCode.Tab)){
         showINV = !showINV;
     }
 }
 
 function OnGUI() {
     if(showINV == true){
          GUI.Box(Rect(0,0,150,150),"Inventory");
     }else{
         return;
     }
 }

That is on my player object. I also have a pickup item script on my player that looks like this:

 #pragma strict
 
 function Update() {
     var cam : Transform = Camera.main.transform;
     var ray = new Ray(cam.position, cam.forward);
     var hit : RaycastHit;
     if(Input.GetKeyDown(KeyCode.E)){
         if(Physics.Raycast (ray, hit, 10)){
             if(hit.collider.tag == "log"){
                 Inventory.inventoryArray[0]++;
                 Destroy(hit.collider.gameObject);
                 Debug.Log("You picked up a log");
             }
         }
     }
 }

Now, what i am trying to do is make it so that whenever I pick up an item, it will add a label to my inventory GUI, then if i pick up another item, it creates a new label below that a couple of pixels.

I wanted to dive right into it and after 20 minutes I figured i had planned myself into oblivion. I'm just looking for a simple way to do this. If anyone can help or at least point me in the right direction it would be very much appreciated. I really hope all this makes sense.

Thanks in advance.