Hi,
I am interested in your project. I have 5-year experience on Opencart. All my completed projects on freelancer.com are on Opencart. You can check my profile to know clearly about this: https://www.freelancer.com/u/Ginjag.html
I understood your requirement. But I need to ask you some questions on your site.
Please feel free to contact me and we discuss about your project.
Hope to work with you.
Thanks
LeNam