Hi, my name is Mihai, I'm a full time web developer focused mostly on large, high traffic, web apps based on ZendFramework most of the time. I'm also working with Wordpress, Codeigniter, Fuelphp.
On Wordpres I did all kinds of projects, from small fixes, theme customization, ecommerce plugin implementation and customization to plugin and theme development from scratch.
I've started working with ecommerce frameworks around 4 years ago, with the old-ish version of osCommerce, which is kind of a pain to work with. Then at my former job I've got the chance to work with Magento, which is a great ecommerce solution, but very complex.
I also worked with storenvy platform which is a light, hosted platform for ecommerce that is intended to small shops and artists.
Last year I started with Shopify and Bigcommerce which are similar in some ways. On Bigcommerce I started with a full website development for a client that I've worked many times for, then I've continued with theme customization based on client specifications. On Shopify I've done tasks similar to yours. I never got the chance to do a website to 0 to fully functional, but having all sorts of tasks I got very familiar with the Shopify template structure.
Best regards,
Mihai Ionescu