Character replacement

well i wanna make a an rpg game where the character has the ability to change shape but i got the problem where i dont know to make a script for that ability, can this script has the function like i want?

static var classselected : boolean = false;
var spawnplace : Transform;
var firstcharacterobject : GameObject;
var secondcharacterobject : GameObject;

function OnGUI ()
{

if(classselected == false)
{
GUI.Box(Rect(0,0,300,500),GUIContent("Character change shape"));
}

if(GUI.Button(Rect(100,100,100,100),GUIContent("First Character")) classselected == false )
{
var instance : GameObject = Instantiate(firstcharacterobject, spawnplace.position, spawnplace.rotation);
classselected = true;
}

if(GUI.Button(Rect(100,200,100,100),GUIContent("Second Character")) classselected == false)
{
var instance2 : GameObject = Instantiate(secondcharacterobject, spawnplace.position, spawnplace.rotation);
classselected = true;
}
}

function Update ()
{
if (classselected == true)
{
Destroy(gameObject);
}
}