How to draw texture in C# without using (new Rect)

I have been using UnityScript for a basic loading screen and it has worked fine. I am getting better at C# now however and I am working on converting all of my scripts over. I have hit a snag though, and I think I know what is causing the problem but I'm not sure how to fix it. When it goes to the screen everything draws, it just shows a still image for the loading bar that previously worked in UnityScript. I THINK it is due to the fact that while parsing it throws errors if you don't use (new Rect (vars, blah, blah)), however in UnityScript it is fine. I have pasted the UnityScript (working) one and the C# (not working) down below. I hope I was clear enough, thanks in advance.

UnityScript

 #pragma strict
 
 private var progress : float = 0;
 private var height = Screen.height / 2 + 100;
 private var heightLogo = Screen.height / 2 - 250;
 private var isLoading : boolean = true;
 var progressBarSize : Vector2 = new Vector2 (400, 40);
 var progressBarEmpty : Texture2D;
 var progressBarFull : Texture2D;
 var companyLogo : Texture2D;
 var gameLogo : Texture2D;
 var splashText : Texture2D;
 var backgroundImage : Texture2D;
 
 function Awake ()
 {
     Application.targetFrameRate = 60;
 }
 
 function Start ()
 {
     var menuSelect = Random.Range(1, 3);
 
     yield WaitForSeconds (15);
     isLoading = false;
     
     yield WaitForSeconds (1);
     Application.LoadLevel (menuSelect);
 }
  
 function OnGUI()
 {
     GUI.DrawTexture (Rect (0, 0, Screen.width, Screen.height), backgroundImage);
 
     if (isLoading == true)
     {
         GUI.DrawTexture (Rect (Screen.width / 2 - 200, height, progressBarSize.x, progressBarSize.y), progressBarEmpty);
         GUI.BeginGroup (new Rect (Screen.width / 2 - 200, height, progressBarSize.x * Mathf.Clamp01(progress), progressBarSize.y));
         GUI.DrawTexture (new Rect (0, 0, progressBarSize.x, progressBarSize.y), progressBarFull);
         GUI.EndGroup();
     }
     
     GUI.DrawTexture (Rect (Screen.width / 2 - 450, heightLogo, 256, 256), companyLogo);
     GUI.DrawTexture (Rect (Screen.width / 2 + 200, heightLogo, 256, 256), gameLogo);
     GUI.DrawTexture (Rect (Screen.width / 2 - 100, Screen.height /2 - 100, 200, 80), splashText);
 }
  
 function Update()
 {
     progress = Time.time * 0.07;
 }
 

C#

 using UnityEngine;
 using System.Collections;
 
 public class LoadScreen : MonoBehaviour
 {
     private float progress = 0;
     private int height = Screen.height / 2 + 100;
     private int heightLogo = Screen.height / 2 - 250;
     private bool isLoading = true;
     public Vector2 progressBarSize = new Vector2 (400, 40);
     public Texture2D progressBarEmpty;
     public Texture2D progressBarFull;
     public Texture2D companyLogo;
     public Texture2D gameLogo;
     public Texture2D splashText;
     public Texture2D backgroundImage;
 
     void Awake ()
     {
         Application.targetFrameRate = 60;
     }
 
     void Start ()
     {
         StartCoroutine (WaitCoroutine ());
     }
 
     void OnGUI ()
     {
         GUI.DrawTexture (new Rect (0, 0, Screen.width, Screen.height), backgroundImage);
         
         if (isLoading == true)
         {
             GUI.DrawTexture (new Rect (Screen.width / 2 - 200, height, progressBarSize.x, progressBarSize.y), progressBarEmpty); // HERE IS WHAT I THINK THE ISSUE IS
             GUI.BeginGroup (new Rect (Screen.width / 2 - 200, height, progressBarSize.x * Mathf.Clamp01(progress), progressBarSize.y));
             GUI.DrawTexture (new Rect (0, 0, progressBarSize.x, progressBarSize.y), progressBarFull);
             GUI.EndGroup();
         }
         
         GUI.DrawTexture (new Rect (Screen.width / 2 - 450, heightLogo, 256, 256), companyLogo);
         GUI.DrawTexture (new Rect (Screen.width / 2 + 200, heightLogo, 256, 256), gameLogo);
         GUI.DrawTexture (new Rect (Screen.width / 2 - 100, Screen.height /2 - 100, 200, 80), splashText);
     }
 
     void Update ()
     {
         
     }
 
     IEnumerator WaitCoroutine()
     {
         int menuSelect = Random.Range(1, 3);
 
         yield return new WaitForSeconds (15);
         isLoading = false;
 
         yield return new WaitForSeconds (1);
         Application.LoadLevel (menuSelect);
 
         yield break;
     }
 }