Build magento as a video game store.

Hi, I'm planning to create a video game store with magento(reference [login to view URL] [login to view URL] [login to view URL] [login to view URL] ). The store is created only for downloadable products. So I need some modifications. #1, Design a entirely new template match the theme.(responsive design required) #2, Redesign magento. Remove shipping, tax or something about tangible products entirely from the system. I only sell the digital products. I don't need this at all. #3, Redesign the sign in & sign up. Because I only sell virtual goods. I don't need the customers real name or other info. Only username & email are needed. The store is focusing on digital products. Although magneot can handle downloadable products. it's not design for this purpose only. I think it needs some enhancement work to handle digital products. Also need some simplifing work. Remove the function not needed. ......... #n, #NOTICE: ONLY EXPERIENCED MANGETO EXPERTS ARE NEEDED!!! HAVE DONE SUCH A PROJECT LIKE THIS!!! BEFORE YOU BID, READ THIS CAREFULLY PLEASE!!! IF I SELECT YOU OR YOUR TEAM TO DO THIS WORK. I WILL PROVIDE YOU A DETAILED DOCUMENT FOR THE NEEDS. SKILLS REQUIREMENT: HTML, PHP, CSS, MYSQL, AJAX, JAVASCRIPT. IF YOU ARE INTEREST IN THIS, LEAVE ME A MESSAGE. NO ADS!!