integrating signup form w/ multi-column layout?

Forgive me if this has been addressed, but I didn’t find it after searching.

I’m looking to integrate my signup form into a template with one main column & one or two sidebars. When I load wp-signup.php it stretches full-width w/in my theme… functional, yes, but not as refined as I’d like. Will this necessitate editing wp-signup.php for layout, or is there a way to drop the signup code into a page, e.g. ?