Custom field placement
Copy node.tpl.php of your theme and name it node--article.tpl.php. In this file create the html structure you like. In this file you have access to the individual fields. 

&lt;?php print render($content['field_customfieldname']); ?&gt;


will print out content of your custom field. Wrap this filed with html id or class and style it with css.
(I am assuming you are working with a non core theme)