UltraCart and customized look to order and checkout pages

We switched from Volusion to UltraCart and the nice-looking webpages we had with Volusion could no longer be used. My web designer could handle customizing the pages for Volusion, but he isn't able to do the same level of work within UltraCart. I need someone to work with the web designer to produce great looking UltraCart-compliant pages for order and checkout. Need is immediate and urgent.