Save Texture in lua table

Hi I'm making my game moddable using MoonSharp. http://www.moonsharp.org/

I'm trying to have a Table represent a Texture2D class. I currently have Vector classes and rect classes working. The way i'm calling Unity functions such as GUI.Box is making a wrapper function that takes a rect represented in a table and converting it to a Rect and it also takes in a string for content.

Maybe I can do something like this which will return a table with the texture information or maybe a key and I can store my textures in a Dictionary? I'm not really sure.

 texture2D = LoadTexture2D("Path");

I Have seen a more direct approach in this video using NLua and I have no idea how that was done. https://www.youtube.com/watch?v=dTI9_dGljmY

Here is my current LUA CODE

 position = {0,0,0};
 rect = {0,0,100,100};
 
 function Start ()
     SetPosition(position);
 end
 
 function Update()
     position[2] = position[2] + 1 * GetDeltaTime();
     DebugLog(position[2]);
     SetPosition(position)
 end
 
 function LateUpdate()    
 end
 
 function OnGUI ()
     GUIBox(rect,"I LIKE LUA");
 end