to create a custom site design using a template, you will need to first prepare the template.
For Site Sculptor the template will need to have the following editable regions:
* Navigation: For inserting the navigation menu
* Content: For inserting the page's content
* Footer: For inserting the footer links
If you want to use a CSS Menu Writer design for the navigation, you will need to create CSS menu Writer preset for the design.
You can modify the existing Real Estate templates to be used by site sculptor, see the following how to for details:
creating-custom-templates.php