Creating prefab by script and using it crashes unity

answer: you can make a script that changes a prefab in a normal scripts and it will kindof work a tiny bit but it's for an Editor Script.

its a script to stack 4 cubes, create an empty prefab and put the 4 cubes in it, then it instantiates the prefab with 4 cubes around in space. it's all fine until i try to instantiate the prefab i just created(at the end), it works and then it goes into a memory loss/crash. Please add a cube prefab to the script and an Assets/Resources folder and it should run.

 @script RequireComponent(MeshFilter)
 
 var rows = 4;  
 var blocks : Transform;//drag a cube to the editor
 private var rot : Quaternion;
 var sp : GameObject;
 
 function Start () 
 { 
     var big : GameObject = gameObject;
     big.transform.position = Vector3(0,0,0);
 
          
     for (var q = 0; q < rows; q++) //make a stack of cubes
     { 
         var displace = Vector3(0,q*1.1,0);
         
         rot.eulerAngles = Vector3(0,0,0);
         var ino = Instantiate(blocks, displace, rot);
         ino.transform.localScale = Vector3(1,1,1);
         ino.transform.parent = big.transform;
     }
     //put stack of cubes into a new prefab in /Resources
     var prefab : Object = EditorUtility.CreateEmptyPrefab("Assets/Resources/pack1.prefab");
     EditorUtility.ReplacePrefab(big, prefab, ReplacePrefabOptions.ConnectToPrefab);
     var go : GameObject = (Resources.Load("pack1"));//Load the prefab
     // for (var r = 0; r < rows; r++) 
     // { 
     var displace2 = Vector3(1.1,0,0);
     var ino2 = Instantiate(go, displace2, rot);//make a second stack next to the first
     ino2.transform.localScale = Vector3(1,1,1);
 
     //}
 }

I'm making some procedural geometry experiments where i copy bunches of blocks into different symmetries. So i am trying to use the Prefab as a kind of local memory so i can copy and paste arrangements of meshes. It's an attempt to make a modular code.