XF 1.4 Menu customizations and more

How do I accomplish the same kind of layout as on this site http://www.teamfiat.com/ ?

I've given up on a paid for template and am now trying to tweak the default theme in to something I'd like so I eventually actually may have a forum up and running.

  1. My forum is set to a max size of 1021px which also cuts of the menu to the same size. But I'd rather like the background of the menu to stretch across the full page as in the fiat site.
  2. Same goes for the bottom menu
  3. How and where do I alter the height of these two menus?
Thanks in advance :)