Hi Obrien,
Why don't you style the FCKeditor according to your website?
Anyway.. The data which is in the editor is retrieved from your database onload, you you could just create a page template, where the original page exists, but with a say, 400px padding on top (add a line of CSS in the header oid) and place the editor in te free space, or add the editor at the bottom of your page, as a footer. Onloading the editor, you also load the page itself.
J.