How to force one column layout on custom post type edit page?

I’ve created a plugin using custom post types and I need to force the default two column post page to a single column. At the same time, the Publish metabox must move to the bottom. I need to do this via the functions some how.

I have some solutions from WPSE, but the only solution I’ve found actually hides the “Publish” metabox. I can’t seem to figure out why.

Any ideas of how to do this?

There is a filter called get_user_option_meta-box-order_{$page} where $page is the name of the post type. Just make sure that submitdiv is the last value in the array:

add_filter( 'get_user_option_meta-box-order_post', 'wpse25793_one_column_for_all' );
function wpse25793_one_column_for_all( $order )
{
    return array(
        'normal'   => join( ",", array(
            'postexcerpt',
            'formatdiv',
            'trackbacksdiv',
            'tagsdiv-post_tag',
            'categorydiv',
            'postimagediv',
            'postcustom',
            'commentstatusdiv',
            'slugdiv',
            'authordiv',
            'submitdiv',
        ) ),
        'side'     => '',
        'advanced' => '',
    );
}