Virtuemart 2.0.x Product Details Page Customisation

Hi there, I need some help in customising parts of my product details page on VM 2.0.x. I already did the main changes but now I need to move to other parts of the website and small details still need to be fixed. To be more specific, I need quantity box, additional price string removed and custom field "size" with link to size chart (like here - [login to view URL] ). I also need a light box gallery for product images. This is installed but needs integration with VM. In addition to that, a really small fix is needed to make the cart module horizontal, displayed on the top of my page. Here is a link to the current page - [login to view URL]