OpenCart to products designer shop!!

I want to custom make t-shirts and some other products like hoodies, full face t-shirts, full face hoodies, zip hoodies, baseball caps, badges etc... biased on OpenCart Iwant the application to integrate with our site. Customers sign in to use the application, choose product, size, colour, design, upload a design and to write text… and pick EL Panels. When someone chooses a design, pays for it, I print it and ship it like the one in this site ( [login to view URL] ) must be NON-FLASH and I'll be able to change the language I want the application to be dynamic. I must be to modify the source code, and upload new designs and new products Can you have a look at that site [login to view URL] I want my customers to do all what that site can do Like for example if the customer want to bay a mug or a t shirt he will be able to but a ready made cliparts or text or upload his own images and post it on the product any where he want After that he put in the cart and pay chick out After that i receive the order with the product picture withe the design on it And a nother picture for the design only to print it out! all that based on OpenCart you can use Jquery UI as long as i can 1- change the language right to left or left to right and when i change the language or the theme of my OpenCart this function will not stop 2- the customer can chose a clipart from the galary or upload hes own clips and can put the design in front and the back 3- when i get the order i can see how the design look like on the product and a picture of the design alone so i can download it and print it on the product thank you