WebStore integration into drupal7 website's MAIN PAGE ONLY

There is a website with custom modules (for rendering) on the main page. There is a 4 pieces tabbed panel on the main page, which needs to have a 5th tab and have a webstore in that container. I've already programmed the 5th tab. I think ubercart or ecommerce could be used for that job. The main requirement is that the webstore needs to take place only in that container, which means the product categories and the products with prices need to be in that container, possibly in a jcarousel frame (the site already uses jCarousel items in other areas). When the user clicks on a product, a fancybox popup window needs to open (the site already uses fancybox popups, so pretty much everything is given), and the user would be able to add these items in the cart. The checkout system should be in a popup also, and everything which is related to buying the products. The owner of the site doesn't allow us to navigate away to another page. Only the main page and that little tabbed container. I attached a couple screenshot of the site where this is more visible. The content of this container is programmed with a custom module, so the webstore should be rendered and programmed with this module also, possibly with views. The work is urgent, I want this to be done by 6th of March.