Hello Friend,
I have gone through your project details, you want to install latest version opencart, and we need to do all below modification, I understand the requirements for this project and interested to discuss more in details to start working into it
We are a 10 year old IT company with highly skilled designers and developers to work on php, Mysql, Jquery, Wordpress, OSC, Magento, OpenCart, Mobile development, iPhone, Responsive etc.
It would be better if you come to have a close discussion over chat .
Best Regards
Harpreet Singh