hi sir i can help you to build this website
i will provide you .
1. design in advanced html5/css3 with the perfect and modern look.
2. responsive website that can be work on mobile devices also. so you don't need any website for mobile same website do the same work.
3. admin panel for managing all thing on the website like upload new template of cover etc.
4. user easily login and order the cover with the help of social login facebook, twitter etc,
6. user able to share the cover in facebook or twitter directly.
7. all functionality is drag and drop from the selection of cover to the
7.1 cover selection .
7.2 image upload ,
7.3 resize the image
7.4 type the text on the cover.
7.5 make a preview to select your phone model.
let me know if you are interested.
thanks.