Build a html presentation layer for an xml feed from Google custom site serach

We need a presentation layer building for the search results page from a Google custom site search. The search is already installed on our website ([login to view URL]) but the search results are in a standard format. We need the result layout changing and for product attributes / rich snippets to be shown. Googles documentation says this can be done by "adding structured data to your webpages and create a presentation layer to transform the XML feeds of the search results." We have already added the structured data but need a presentation layer building. We would like larger thumbnail images and some of the product attributes to be shown in the search results including price, manufacturer part number and our part number. There are two screenshots attached. One is the existing layout and the second is the layout we would like to implement.