How to print all Webform messages outside the form?
Yes, Webform is working on drupal default message 

&lt;?php if ($messages): ?&gt;
  &lt;div id="messages"&gt;&lt;div class="section clearfix"&gt;
    &lt;?php print $messages; ?&gt;
  &lt;/div&gt;&lt;/div&gt; &lt;!-- /.section, /#messages --&gt;
&lt;?php endif; ?&gt; 


You need to put this code according to your requirement on the template (page.tpl.php).

Finally, webform submission thank you message will be shown on your content section which is coming on node.tpl.php 

&lt;?php print $links; ?&gt;