OpenCart product design website

Project Description:
Hi All,

I am abut to start a business printing tees, hoodies, cups etc and also car signwriting.

I would love a site similar to - http://www.spreadshirt.com/create-your-own-t-shirt-C59 in both the way the customer can design things online but also the cosmetiics of the website - i like the look and feel of it.

The site should be on the newest version of Opencart.

I want the customers to sign in to use the application, choose product, size, colour, design, upload a design and to write text. There may be different views of one product ie a tee would be front & back, a car vector would show the side view, bonnet etc. - i would like these shown as thumbnails as in the website mentioned above. i have scaled vectors that i'd like to add to the catalogue myself.

when the customer has designed their product and paid for it, i'd need to receive the order in the backend, showing boththe images to print and the overall image of what the customer has designed.

i need it to look fresh and modern.

i need to be able to add items, graphics, fonts etc so i continue to add to the product base

also, if possible, i would like a mobile version of the site.

thank you
Sharleen