Problem Altering Width Of Template

I have been playing around with a page on a site (http://www.haylockpittman.co.uk/new-refurb-publish/) but the previous designer has made the bottom half the template. This means that a widget calls up the text and the mini sidebar.
At the bottom though I have been trying to remove the clients and recents posts section and make the rest of the text etc over the full width. I can lose the sidebar part easy enough but no matter what I do I cannot make the text over the full width.
Any help would be really gratefully received. Below is the template php code

<?php
/*
Template Name: New Refurb
*/
?>
<?php
/**
 * Template Name: Front Page Template
 * Description: A Page Template that showcases Sticky Posts, Asides, and Blog Posts
 *
 * The showcase template in Twenty Eleven consists of a featured posts section using sticky posts,
 * another recent posts area (with the latest post shown in full and the rest as a list)
 * and a left sidebar holding aside posts.
 *
 * We are creating two queries to fetch the proper posts and a custom widget for the sidebar.
 *
 * @package WordPress
 * @subpackage Twenty_Eleven
 * @since Twenty Eleven 1.0
 */

// Enqueue showcase script for the slider
wp_enqueue_script( 'twentyeleven-showcase', get_template_directory_uri() . '/js/showcase.js', array( 'jquery' ), '2011-04-28' );

get_header(); ?>

		<div id="primary" class="showcase">
			<div id="content" role="main">

				<?php the_post(); ?>

				<?php
					/**
					 * We are using a heading by rendering the_content
					 * If we have content for this page, let's display it.
					 */
					if ( '' != get_the_content() )
						get_template_part( 'content', 'intro' );
				?>

				<?php
					/**
					 * Begin the featured posts section.
					 *
					 * See if we have any sticky posts and use them to create our featured posts.
					 * We limit the featured posts at ten.
					 */
					$sticky = get_option( 'sticky_posts' );

					// Proceed only if sticky posts exist.
					if ( ! empty( $sticky ) ) :

					$featured_args = array(
						'post__in' => $sticky,
						'post_status' => 'publish',
						'posts_per_page' => 10,
						'no_found_rows' => true,
					);

					// The Featured Posts query.
					$featured = new WP_Query( $featured_args );

					// Proceed only if published posts exist
					if ( $featured->have_posts() ) :

					/**
					 * We will need to count featured posts starting from zero
					 * to create the slider navigation.
					 */
					$counter_slider = 0;

					?>

				<div class="featured-posts">
					<h1 class="showcase-heading"><?php _e( 'Featured Post', 'twentyeleven' ); ?></h1>

				<?php endif; // End check for published posts. ?>
				<?php endif; // End check for sticky posts. ?>
				<div id="about">
					 <?php dynamic_sidebar( 'New refurb' ); ?>
					 </div>
					 <div id="side">
				 <?php dynamic_sidebar( 'Showcase Sidebar' ); ?></div>

			</div><!-- #content -->
		</div><!-- #primary -->

<?php get_footer(); ?>