Design your Tshirt website

Another design your T-Shirt web-site. We would like exactly the same features as : [login to view URL] or [login to view URL] or [login to view URL] (we are also thinking to do other products than TShirts) If possible we would prefer people who already have implemented this solution (Let me know in the PMB). The web-site will initially be in 2 languages, and we would like later to be able to add languages easily.