Header width and header top sidebar

Hi, First of all, thansk for a GREAT theme! Is it possible to change the location of the header to under the menu? I want to have it in this order: Logo header menu body etc.. Also, the header image isnt covering the whole screen. is it possible to set header width="100%"? I also want to add images and other stuff at the top center of our webpage and testad to insert it in widget "Header top siderbar" but it then shows up in the top right corner just as "Header right sidebar" Thanks!