Build and design joomla webshop from scratch

We, a Swedish design company needs help to build our webshop. The website is completed, and the webshop is supposed to be integrated to an iframe. The webshop needs to follow the same design as the rest of the page, components for this will be provided. The system we're using is Joomla and no template is planned to be used. This project is under a very tight deadline, the page is beeing launched at the 27:th of December, and the webshop has to be done asap.