OK, my two cents... Yes, float the header, and...
#headerWrapper {width: 580px; float: right;}
#navColumnOne {float: left; margin-top: 130px;}
#navBreadCrumb {margin-top: 240px;}
#navColumnTwo {display: none;} (actually just turn off in admin)
Apply these to a fresh install and see how you get the basic layout already, just a bit more tweaking and box styling required.




