Custom Post Type Templates Constructor Area

cpt-template-contructor-area.php

<?php
/*
Plugin Name: CPT Templates
Plugin URI: http://www.riversportokc.org/
Description: Create Custom Post Type Templates
Author: BigWing Interactive
Version: 1.0.0
Requires at least: 4.1
Author URI: http://bigwing.com
Contributors: ronalfy, bigwing
*/  
class CPT_Templates {
    private static $instance = null;
	private $post_types      = '';
	
	//Singleton
	public static function get_instance() {
		if ( null == self::$instance ) {
			self::$instance = new self;
		}
		return self::$instance;
	} //end get_instance
	
	private function __construct() {
		add_action( 'init', array( &$this, 'init' ), 9 );
		add_action( 'save_post', array( &$this, 'save_post' ) );
		add_filter( 'template_include', array( &$this, 'maybe_get_cpt_template' ) );
		
		$this->post_types = array(
			'gallery',
			'book'
		);
	} //end init