How to remove loop from genesis page template and create new loop?

<?php
/**
 * Template Name: Testimonial Archives
 * Description: Used as a page template to show page contents, followed by a loop through a CPT archive  
 */
remove_action ('genesis_loop', 'genesis_do_loop'); // Remove the standard loop
add_action( 'genesis_loop', 'custom_do_loop' ); // Add custom loop
function custom_do_loop() {
    	
	// Intro Text (from page content)
	echo '<div class="page hentry entry">';
	echo '<h1 class="entry-title">'. get_the_title() .'</h1>';
	echo '<div class="entry-content">' . get_the_content() ;
	$args = array(
		'post_type' => 'testimonials', // enter your custom post type
		'orderby' => 'menu_order',
		'order' => 'ASC',
		'posts_per_page'=> '12',  // overrides posts per page in theme settings
	);
	$loop = new WP_Query( $args );
	if( $loop->have_posts() ):
				
		while( $loop->have_posts() ): $loop->the_post(); global $post;
		echo '<div id="testimonials">';
			echo '<div class="one-fourth first">';
			echo '<div class="testimonial-image">'. get_the_post_thumbnail( $id, array(150,150) ).'</div>';
			echo '<cite>' . genesis_get_custom_field( '_cd_client_name' ) . '</cite>'; //retrieve custom field
                        echo '<br />' . genesis_get_custom_field( '_cd_client_title' ); //retrieve custom field
			echo '</div>';	
			echo '<div class="three-fourths">';
			echo '<h3>' . get_the_title() . '</h3>';
			echo '<blockquote>' . get_the_content() . '</blockquote>';	
			echo '</div>';
		echo '</div>';
		
		endwhile;
		
	endif;
	
	// Outro Text (hard coded)
	echo '<div class="call-to-action">My call to action text. <a href="">Contact me</a></div>';
	echo '</div><!-- end .entry-content -->';
	echo '</div><!-- end .page .hentry .entry -->';
}
	
/** Remove Post Info */
remove_action('genesis_before_post_content','genesis_post_info');
remove_action('genesis_after_post_content','genesis_post_meta');
 
genesis();