Adding Custom Products order pane to cart and checkout

I'd like to show the "Custom Products" order pane, which you see on completed orders (user/*/orders/*) to the cart and checkout pages

I found this, which seems to be the relevant bit of code, in uc_node_checkout.module

/**
 * Handles the "Custom Products" order pane.
 */
function uc_node_checkout_order_pane_nodes($op, $arg1) {
  switch ($op) {
    case 'view':
    case 'customer':
      $order = $arg1;

      $output  = '<p>' . t('The following products in this order have customizations described below.') . '</p>';
      $output .= '<p>' . t('Please click each link to view more information.') . '</p>';
      foreach ($order->products as $product) {

        // Check for a node type association
        $has_association = isset($product->data['node_checkout_nid']);

        // If an association was not found check if there should have been
        if (!$has_association) {
          $association_node_type = uc_node_checkout_node_type_association($product->nid);
        }

        // Create a row for customised products
        if ($has_association) {
          $node_checkout_node = node_load($product->data['node_checkout_nid']);
          $items[] = l(t('@product_title (SKU @product_model) - @node_checkout_title',
                         array('@product_title' => $product->title,
                               '@product_model' => $product->model,
                               '@node_checkout_title' => $node_checkout_node->title)),
              'node/' . $node_checkout_node->nid, array('html' => TRUE));
        }

        // Create a row for should-be customised products
        if (!$has_association && $association_node_type) {
          $items[] = t('(!create_now_link) The product %product_title (SKU %product_model) is missing its node customisation.',
            array(
              '%product_title' => $product->title,
              '%product_model' => $product->model,
              '!create_now_link' => l(t('Create node association'), 'node/add/' . str_replace('_', '-', $association_node_type),
                array('query' => array('order_id' => $order->order_id, 'product_id' => $product->nid, 'order_product_id' => $product->order_product_id))),
            )
          );
        }
      }

      if (!empty($items)) {
        $output .= theme('item_list', array('items' => $items));
        return array('#markup' => $output);
      }
      else {
        return '';
      }
  }
}

How would I go about adding that (or the right code, it this will not do it!?) to a template file for both the cart and checkout?

I looked at http://www.ubercart.org/docs/user/32119/how_theme_checkout_pane_ubercart_3
and guess I should be able to add the above code to the below from uc_cart_checkout_pane.inc

/**
 * Formats the cart contents table on the checkout page.
 *
 * @param $variables
 *   An associative array containing:
 *   - show_subtotal: TRUE or FALSE indicating if you want a subtotal row
 *     displayed in the table.
 *   - items: An associative array of cart item information containing:
 *     - qty: Quantity in cart.
 *     - title: Item title.
 *     - price: Item price.
 *     - desc: Item description.
 *
 * @return
 *   The HTML output for the cart review table.
 *
 * @ingroup themeable
 */
function responsive_business_uc_cart_review_table($variables) {
  $items = $variables['items'];
  $show_subtotal = $variables['show_subtotal'];

  $subtotal = 0;

  // Set up table header.
  $header = array(
    array('data' => theme('uc_qty_label'), 'class' => array('qty')),
    array('data' => t('Products'), 'class' => array('products')),
    array('data' => t('Price'), 'class' => array('price')),
  );


  // Set up table rows.
  $display_items = uc_order_product_view_multiple($items);
  if (!empty($display_items['uc_order_product'])) {
    foreach (element_children($display_items['uc_order_product']) as $key) {
       $display_item = $display_items['uc_order_product'][$key];
      $subtotal += $display_item['total']['#price'];
      $rows[] = array(
        array('data' => $display_item['qty'], 'class' => array('qty')),
    //    array('data' => $display_item['product'], 'class' => array('products')),
        array('data' => $display_item[''], 'class' => array('osb')),
        array('data' => $display_item['total'], 'class' => array('price')),
      );
    }
  }

  // Add the subtotal as the final row.
  if ($show_subtotal) {
    $rows[] = array(
      'data' => array(
        // One cell
        array(
          'data' => array(
            '#theme' => 'uc_price',
            '#prefix' => '<span id="subtotal-title">' . t('Subtotal:') . '</span> ',
            '#price' => $subtotal,
          ),
          // Cell attributes
          'colspan' => 3,
          'class' => array('subtotal'),
        ),
      ),
      // Row attributes
      'class' => array('subtotal'),
    );
  }

  return theme('table', array('header' => $header, 'rows' => $rows, 'attributes' => array('class' => array('cart-review'))));
}

/**
 * Themes cart items on the checkout review order page.
 *
 * @param $variables
 *   An associative array containing:
 *   - items: An associative array of cart item information containing:
 *     - qty: Quantity in cart.
 *     - title: Item title.
 *     - price: Item price.
 *     - desc: Item description.
 *
 * @return
 *   A string of HTML for the page contents.
 *
 * @ingroup themeable
 */
function responsive_business_uc_checkout_pane_cart_review($variables) {
  $rows = array();
  $items = uc_order_product_view_multiple($variables['items']);

  foreach (element_children($items['uc_order_product']) as $key) {
    $item = $items['uc_order_product'][$key];
    $rows[] = array(
      array('data' => $item['qty'], 'class' => array('qty')),
      array('data' => $item['product'], 'class' => array('products')),
      array('data' => $item['total'], 'class' => array('price')),
    );
  }

  return theme('table', array('rows' => $rows, 'attributes' => array('class' => array('cart-review'))));;
}

but I can barely read php let alone write it!

Am I on the right track?