Yes!  This feature is currently in Beta, but we give you complete control of the HTML / CSS so you can tweak the entire page.  You can use the <a href="https://github.com/Shopify/liquid/wiki/Liquid-for-Designers">Liquid Templating Language</a> to control dynamic elements of the page (like order number, links to the files, etc).

Please open a ticket if you wish to try it out.