CPT plus code for post grid

<?php
function major_trips_cpt() {
  $args = array(
    'labels' => array(
        'name'          => 'Major Trips',
        'singular_name' => 'Major Trip',
       'all_items'     => 'All Major Trips',
    ),
    'supports'      => array( 'title', 'editor', 'excerpt', 'author', 'thumbnail', 'comments', 'revisions', 'custom-fields' ),
    'menu_position' => 4,
    'show_ui'             => true,
    'show_in_menu'        => true,
    'show_in_admin_bar'   => true,
    'description'   => ( 'New Major Trip Entry'),
    'public'        => true,
    'has_archive'   => true,
    'menu_icon'     => get_stylesheet_directory_uri() . '/images/fwdaus-icon.png',
    'rewrite'        => array('slug' => '4wdaus-major_trips')
  );
  register_post_type( 'major_trip', $args );
}
add_action( 'init', 'major_trips_cpt' );
?>

//Code for displaying grid of blog posts for the relevant category
<!-- Search all posts for those with the category for this major_trip -->
  <?php
   $args = array(
       'post_type' => 'post',
       'posts_per_page' => 6,
       'order' => 'desc',
       'orderby' => 'date',
       'tax_query' => array(
           array(
               'taxonomy' => 'category',
               'field'    => 'slug',
               'terms'    => get_field('category_to_display'), // category from the Advanced Custom Field variable
           ),
       ),
   );

    if ( get_query_var('paged') ) {
        $args['paged'] = get_query_var('paged');
    } elseif ( get_query_var('page') ) {
        $args['paged'] = get_query_var('page');
    } else {
        $args['paged'] = 1;
    }

    $the_query = new WP_Query( $args );

   // Pagination fix
   $temp_query = $wp_query;
    $wp_query   = NULL;
    $wp_query   = $the_query;
  ?>

 <div id="fwd-blog-grid">
 <?php if ( $the_query->have_posts() ) : ?>
     <?php while ( $the_query->have_posts() ) : $the_query->the_post(); ?>
         <div class="fwd-grid-item">
             <?php if ( has_post_thumbnail() ) {
                 the_post_thumbnail();
             } ?>
             <h2><a href='<?php the_permalink(); ?>'><?php the_title(); ?></a></h2>
             <div class="entry-content">
                 <a href='<?php the_permalink(); ?>'><?php the_excerpt(); ?></a>
             </div>
         </div>
     <?php endwhile; ?>

     <?php
         wp_reset_postdata();

         echo "<div style='clear: both;'>";
            //wp_pagenavi( array( 'query' => $the_query ) );
            echo "<div style='float: left;'>";
                next_posts_link( '&laquo; Older Posts' );
            echo "</div>";
            echo "<div style='float: right;'>";
                    previous_posts_link( 'Newer Posts &raquo;' );
                echo "</div>";
         echo "</div>";

         // Reset main query object
         $wp_query = NULL;
         $wp_query = $temp_query;
     ?>
</div>