crafting script

#pragma strict

var MenuSkin : GUISkin;

//References
var player : GameObject;
var mainCamera : GameObject;
var arms : GameObject;

//Icons
var campfireIcon : Texture;
var BigTentIcon : Texture;
var teepeeIcon : Texture;
var tentIcon : Texture;
var emptyIcon2 : Texture;
var emptyIcon3 : Texture;
var emptyIcon4 : Texture;
var emptyIcon5 : Texture;
var emptyIcon6 : Texture;

//Player prefabs
var campFire : GameObject;
var BigTent : GameObject;
var teepee : GameObject;
var tent : GameObject;
var empty2 : GameObject;
var empty3 : GameObject;
var empty4 : GameObject;
var empty5 : GameObject;
var empty6 : GameObject;

// scripts

private var showGUI : boolean = false;

private var invScript : Inventory;

function Start()
{
    invScript = GetComponent(Inventory);
}

function Update()
{
    if(Input.GetKeyDown("c"))
    {

        showGUI = !showGUI;

    }

    if(showGUI == true)
    {
        Time.timeScale = 0;
        player.GetComponent(FPSInputController).enabled = false;
        player.GetComponent(MouseLook).enabled = false;
        mainCamera.GetComponent(MouseLook).enabled = false;
        arms.GetComponent(PlayerControl).enabled = false;
    }

    if(showGUI == false)
    {
        Time.timeScale = 1;
        player.GetComponent(FPSInputController).enabled = true;
        player.GetComponent(MouseLook).enabled = true;
        mainCamera.GetComponent(MouseLook).enabled = true;
        arms.GetComponent(PlayerControl).enabled = true;

    }
}

function OnGUI()
{
    if(showGUI == true)
    {

        GUI.skin = MenuSkin;
            GUI.BeginGroup(new Rect(Screen.width/2-150,Screen.height/2-150,300,300));
                GUI.Box(Rect(0 , 0, 260, 300),"Crafting System");

                if(GUI.Button(Rect(10, 50, 50, 50), GUIContent (campfireIcon, "Build a campfire")))
                {
                    if(invScript.wood >= 6 && invScript.stone >= 3)
                    {
                        campFire.SetActive(true);
                        BigTent.SetActive(false);
                        tent.SetActive(false);
                        teepee.SetActive(false);
                        invScript.wood -= 6;
                        invScript.stone -= 3;
                    }
                }

                if(GUI.Button(Rect(10, 120, 50, 50), GUIContent (BigTentIcon, "Build a Bigger Tent?")))
                {
                    if(invScript.wood >= 10 && invScript.stone >= 5 && invScript.clay >= 3)
                    {
                        BigTent.SetActive(true);
                        campFire.SetActive(false);
                        teepee.SetActive(false);
                        tent.SetActive(false);
                        invScript.wood -= 10;
                        invScript.stone -= 5;
                    }
                }

                if(GUI.Button(Rect(10, 190, 50, 50), GUIContent(teepeeIcon, "Build a TeePee!")))
                {
                    if(invScript.wood >= 10 && invScript.stone >= 5)
                    {
                        teepee.SetActive(true);
                        BigTent.SetActive(false);
                        tent.SetActive(false);
                        campFire.SetActive(false);
                        invScript.wood -= 10;
                        invScript.stone -= 5;
                    }
                }

                // SECOND COLLUMN

                if(GUI.Button(Rect(100, 50, 50, 50), GUIContent(tentIcon, "Build a tent!")))
                {
                    if(invScript.wood >= 10 && invScript.stone >= 5)
                    {
                        tent.SetActive(true);
                        teepee.SetActive(false);
                        BigTent.SetActive(false);
                        campFire.SetActive(false);
                        invScript.wood -= 10;
                        invScript.stone -= 5;
                    }
                }

                    if(GUI.Button(Rect(100, 120, 50, 50), GUIContent(emptyIcon2, "This is just a place holder")))
                {
                    if(invScript.wood >= 10 && invScript.stone >= 5)
                    {
                        empty2.SetActive(true);
                        teepee.SetActive(false);
                        BigTent.SetActive(false);
                        campFire.SetActive(false);
                        invScript.wood -= 10;
                        invScript.stone -= 5;
                    }
                }

                if(GUI.Button(Rect(100, 190, 50, 50), GUIContent(emptyIcon3, "This is just a place holder")))
                {
                    if(invScript.wood >= 10 && invScript.stone >= 5)
                    {
                        empty3.SetActive(true);
                        teepee.SetActive(false);
                        BigTent.SetActive(false);
                        campFire.SetActive(false);
                        invScript.wood -= 10;
                        invScript.stone -= 5;
                    }
                }

                if(GUI.Button(Rect(190, 50, 50, 50), GUIContent(emptyIcon4, "This is just a place holder")))
                {
                    if(invScript.wood >= 10 && invScript.stone >= 5)
                    {
                        empty4.SetActive(true);
                        teepee.SetActive(false);
                        BigTent.SetActive(false);
                        campFire.SetActive(false);
                        invScript.wood -= 10;
                        invScript.stone -= 5;
                    }
                }

                if(GUI.Button(Rect(190, 120, 50, 50), GUIContent(emptyIcon5, "This is just a place holder")))
                {
                    if(invScript.wood >= 10 && invScript.stone >= 5)
                    {
                        empty5.SetActive(true);
                        teepee.SetActive(false);
                        BigTent.SetActive(false);
                        campFire.SetActive(false);
                        invScript.wood -= 10;
                        invScript.stone -= 5;
                    }
                }

                if(GUI.Button(Rect(190, 190, 50, 50), GUIContent(emptyIcon6, "This is just a place holder")))
                {
                    if(invScript.wood >= 10 && invScript.stone >= 5)
                    {
                        empty6.SetActive(true);
                        teepee.SetActive(false);
                        BigTent.SetActive(false);
                        campFire.SetActive(false);
                        invScript.wood -= 10;
                        invScript.stone -= 5;
                    }
                }


                GUI.Label (Rect (100, 250, 100, 40), GUI.tooltip);
                GUI.EndGroup ();
      }
}