test.php

<?php
  add_action('template_redirect','my_template_redirect');
  function my_template_redirect() {
    if (get_post_type() == 'location') {
      global $wp_query;
      add_post_meta($wp_query->post->ID,'_wp_page_template','custom_template.php',TRUE);
      $wp_query->is_page = true;
    }
  }
  // custom template
  remove_action('thesis_hook_custom_template', 'thesis_custom_template_sample');
  add_action('thesis_hook_custom_template', 'my_thesis_hook_custom_template');
  function my_thesis_hook_custom_template() {
    if (get_post_type() == 'location') require_once TEMPLATEPATH . '/custom/location_template.php'; 
  }
?>