<div class="new_complex_form">
  <div class="left_column">
    <div class="block_grey_border">
      <?php print drupal_render($form['general']['main']['right_side']); ?>
    </div>

    <?php if (isset($form['customization']['main']['type_of_upload'])): ?>
      <?php print drupal_render($form['customization']['main']['type_of_upload']); ?>
    <?php endif; ?>

    <div class="block_grey_border">
      <?php print drupal_render($form['customization']['main']['left_side']); ?>
      <?php print drupal_render($form['customization']['main']['upload_design']); ?>
      <?php print drupal_render($form['customization']['main']['request_design']); ?>
    </div>
  </div>
  <div class="right_column">
    <div class="block_grey_border">
      <?php print drupal_render($form['customization']['main']['right_side']); ?>

      <?php if (isset($form['properties'])): ?>
        <?php print drupal_render($form['properties']); ?>
      <?php endif; ?>
    </div>

    <?php print drupal_render($form['buy']); ?>
    <?php print drupal_render($form['main']); ?>
  </div>
</div>

<?php print drupal_render($form['customization']); ?>

<!-- Render required hidden fields. -->
<?php print drupal_render_children($form); ?>