I'm no expert in CSS and have only started using Sculptor myself, but I think you should be able to start with one of the provided layouts and build your site without too many problemes including the borders and dividers.
One thing I'm not sure about tho is the menu in the header. You may want to use CSS menu writer and create a horizontal menu, or keep it as it looks - but still use a css menu. That way you'll be 100% CSS.