Build a online store for video games downloading sale.

I'm preparing for creating a online store for a long time. I decide to run this project with Prestashop. I tested Prestashop on my computer. I find it that it supports digital downloads. But very limited. So I need some enhancement work to be done. I need some modifications to the core files. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ BEFORE YOU BID, PLEASE READ THE REQUIRMENTS BELOW CAREFULLY!!!! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ NOTICE: Only experienced PHP experts very familiar with Prestashop are needed. Newbies don't bid, Please!!!! Requirements: #1. Add the ability to handle digital downloads on another server. Not only the server Prestashop installed. #2. Remove the shipping method entirely from the system. #3. Add a bundle products feature(Redisgn the Pack function) #4. Entirely design a new responsive theme(I'll provide PSD files) #5. Redesign the registration form. Only Username and Email are needed. Remove all the unnecessary fileds.(Match the database entries, not just shield it one the frontend!!!!) #6. Redesign the checkout page. One-step checkout. Customers choose their favorite payment method and get the product directly. #7. Add gift sending function. Customers can choose current products as a gift sending to others in the checkout page. The person will recieve a email that contains a redom serial code. They can redeem it and then download the product.(If this function is hard to implement. we can do this in the future when it can be done.I'm looking for a long-term technical support parter.) #8. Do some modification that a digital product can only be added in cart for once. When it's already in cart. The add-to-cart button shows in-cart. #9. Add a label function. When adding a new product, can choose a small image as label adding to the products(ex. new, special, hot or something like that) ============================================================================================================================ Skills requirments: PHP, Mysql, Ajax, Javascript, CSS, HTML, Smarty Template. Above are what all I need. You can reference the [login to view URL] [login to view URL] [login to view URL] If you are interest in this, lease me a message. Thanks you guys very much.