Hello Jim,
Thank you for interesting our EShop extension. EShop is able to work with any custom templates that you use on your site because it is a Joomla Standard MVC extension and has its own style control. I also checked the Epic Pro template from Joomlashine and I am sure that EShop will work well with this template.
After installing EShop on this site, if you need any changes to make EShop mark the template, then I will be ready to help you.
If you have any more questions, please don't hesitate to let me know.
Sincerely, Giang
