No other nice option rather than template making!
Or Including a template file when that custom post type archive (according to its url) is accessed.
See further links for more info:
http://codex.wordpress.org/Function_Reference/load_template
wordpress - load a template based on the URIwordpress - load a template based on the URI
http://www.mihaivalentin.com/wordpress-tutorial-load-the-template-you-want-with-template_redirect/