Render a page from the main navigation as a Reveal window in your required+ Foundation child theme.

child-theme.js

/**
 * Here goes all the JS Code you need in your child theme buddy!
 */
(function($) {

    // Find the ID on the menu item you want reveal to open with
    $("#menu-item-342").click( function( event ) {
        event.preventDefault();
        // The ID of our freshly creafted modal window content
        $("#page-to-modal-317").reveal();
    });

}(jQuery));

functions.php

<?php
/**
 * Add page content as Reveal modal
 *
 * Render page content as a Reveal modal
 * window and put it out just above the
 * closing </body> tag, as Foundation
 * recommends.
 *
 * @link http://foundation.zurb.com/docs/reveal.php
 */
function required_page_content_reveal() {

  $page_id = 317; // Change this to your page ID
  $page_data = get_page( $page_id );
  if ( $page_data ) : ?>

	<div id="page-to-modal-<?php echo $page_data->ID; ?>" class="reveal-modal">
	  <h2><?php echo $page_data->post_title; ?></h2>
	  <?php echo apply_filters('the_content', $page_data->post_content); ?>
	  <a class="close-reveal-modal">&#215;</a>
	</div>

  <?php endif;
}
add_action( 'wp_footer', 'required_page_content_reveal' );