Press a HTML template to an existing os commerce website. And change the os commerce website to run the style of the new template thoughout the site. There is many added features to the os commerce site and it is very advanced and these features much remain on the new site. A reference site I would like the os commerce site to be like is maximuscle. So an ecommerce site with added information pages.
Please only respond if you are confident you can work on advanced os commerce sites and press an HTML template to such a site and retain functionality.