how to put the objects together (javascript)

Description: I want to make a building by script. THe building has its parts as a flat, a parvis, a ground floor, a second floor etc. In the script below i made functions for each part of the building. Then in the main function start() i create these parts and next i try to combine them under their 'father object' flat.

Here's the script:

 class IonianHouse{
 //create the shapes of IonianHouse building parts
 var oParvis = GameObject.CreatePrimitive(PrimitiveType.Cube);
 var oFlat = GameObject.CreatePrimitive(PrimitiveType.Cube);
 var oGroundFloor =    GameObject.CreatePrimitive(PrimitiveType.Cube);
 var oFirstFloor =    GameObject.CreatePrimitive(PrimitiveType.Cube);
 var oLeftCube =     GameObject.CreatePrimitive(PrimitiveType.Cube);
 var oRightCube = GameObject.CreatePrimitive(PrimitiveType.Cube);
 var oFirstFloorRoof = GameObject.CreatePrimitive(PrimitiveType.Cube);
 var oColumn = GameObject.CreatePrimitive(PrimitiveType.Cylinder);
 
 var rot: Quaternion = Quaternion.identity;
 
 function Collumns(){
     
     var cloneColumn = Instantiate(oColumn , Vector3(-79.01502,3.930318,10.8331), rot);
 
     //Choose a Structure, which is more capable for the collumn objects    
     var aColumns : GameObject[3];
 
     oColumn.transform.localScale.x =0.6616377; //X scale of the collumn
     oColumn.transform.localScale.y =3.189006; //Y scale of the collumn
     oColumn.transform.localScale.z = 0.9843928; //Z scale of the collumn
 
     //Set the Collumns
     for(var i =0; i<=aColumns.length; i++){
         //puts in the Array the oColumn object clones         
         aColumns[i] = cloneColumn;
         cloneColumn.Vector3.x += -2; // puts every oColumn object clone near to the next one, X point distance of every clone is -2 
         }
 }
 
 function GroundFloor(){
     var pos = oGroundFloor.transform.position;
     pos = Vector3(-82.50504,3.930318,30.67108);
     oGroundFloor.transform.localScale.x = 14.22;
     oGroundFloor.transform.localScale.y = 6.35;
     oGroundFloor.transform.localScale.z = 32.66;
     Instantiate(oGroundFloor, pos, rot);
 }
 
 function FirstFloor(){
     var pos = oFirstFloor.transform.position;
     pos = Vector3(-82.50504,9.904648,27.14175);
     oFirstFloor.transform.localScale.x = 14.22;
     oFirstFloor.transform.localScale.y = 5.53;
     oFirstFloor.transform.localScale.z = 18.01;
     Instantiate(oFirstFloor, pos, rot);
 }
 
 function Flat(){
     var pos = oFlat.transform.position;
     pos = Vector3(-82.49211,0.4076467,27.69778);
     oFlat.transform.localScale.x = 14.22;
     oFlat.transform.localScale.y = 0.78;
     oFlat.transform.localScale.z = 38.55168;
     Instantiate(oFlat, pos, rot);
 }
 
 function LeftCube(){
     var pos = oLeftCube.transform.position;
     pos = Vector3(-77.17271,3.258567,12.60766);
     oLeftCube.transform.localScale.x = 3.62;
     oLeftCube.transform.localScale.y = 4.97;
     oLeftCube.transform.localScale.z = 3.61;
     Instantiate(oLeftCube, pos, rot);
 }
 
 function RightCube(){
     var pos = oRightCube.transform.position;
     pos = Vector3(-87.83255,3.258567,12.60766);
     oRightCube.transform.localScale.x = 3.62;
     oRightCube.transform.localScale.y = 4.97;
     oRightCube.transform.localScale.z = 3.61;
     Instantiate(oRightCube, pos, rot);
 }
 
 function Parvis(){
     var pos = oParvis.transform.position;
     pos = Vector3(-87.12512,-0.006041527,51.18095);
     oParvis.transform.localScale.x = 20.05;
     oParvis.transform.localScale.y = 0;
     oParvis.transform.localScale.z = 15.84;
     oParvis.transform.rotation.y = 36.25169;
     Instantiate(oParvis, pos, rot);
 }
 
 function Start () {
     Parvis();
     Flat();
     GroundFloor();
     FirstFloor();
     RightCube();
     LeftCube();
     Collumns();
     
     if (oFlat != null){
         //conect the objects: parent-children
     oFlat.transform.parent = GameObject.Find("oGroundFloor").transform;
     oFlat.transform.parent = GameObject.Find("oParvis").transform;
     oFlat.transform.parent = GameObject.Find("oRightCube").transform;
     oFlat.transform.parent = GameObject.Find("oLeftCube").transform;
     oFlat.transform.parent = GameObject.Find("oFirstFloor").transform;
     oFlat.transform.parent = GameObject.Find("oColumn").transform;
     }
     
 } }    

Is there something wrong with the code according to what i want to do? Thanks in advance.