Build an Online Store magento or opencart, integrate to ebay/amazon

[login to view URL] site project requirements – A new ecommerce website to sell our decorated tshirts, bags, hoodies, sweatshirts and other garments. Must integrate with Ebay and Amazon (see below), for full requirements see below., replacing our current site of [login to view URL] and its online store at [login to view URL] Main ecommerce platform to be used – Magento or opencart – will consider others, must know why you recommend them and what ebay/amazon plugin will work properly that covers the requirements below if not custom api. Prime requirement is site capability to integrate fully with ebay, amazon and possibly in future rakuten - If any external script is required for integration you must recommend best script for separate purchase. You must also state if bid price includes code to integrate or whether script needs to be purchased and whether bid price includeds script. Fully integrate means must be able to populate stock categories, products, product title, long description, variations, sizes, images and price from current ebay auctions (over 1000 auctions currently). Orders from ebay and amazon should also be track track of through website so customer details, stock levels etc are maintained. Orders from ebay and amazon should allow for shipping labels/delivery info to be maintained through website not just ebay and amazon. Must be able to add/edit products on store then push to ebay and amazon. Extensions for ebay and amazon can be purchased separately, but you must recommend which ones should be purchased that meet these requirements correctly. Once purchased they must be configured and be working Site colours to be same as current site – [login to view URL] - orange, black and white. Company logo to be used same as www.ramgfx.co.uk. Seo urls. Product pictures to use std ebay pictures (size can differ). Home page should rotate on slider from newest, best seller and highlighted products (sale items as well?) – selectable from backend. Must work on mobile and tablet (responsive). Must work on current browsers (firefox, chrome, safari, IE). Full social networking integration, ability to send products to selected social media app. Allow users to upload own artwork to be used on a garment, similar to the functionality on this site - [login to view URL] so users can choose a blank template for shirt, hoody, jacket etc, then upload own images to get printed onto them. Need to be able to add new templates to this functionality to increase printed items in future. May need external script addon for this as well, please say which script and whether bid price includes purchase price. Own hosting to be used (already purchased) which may need server optimization for ecommerce (especially if magento). Payment gateways – paypal, 2co, amazon (plus more selectable at back end) Email subscribe for newsletters, new product info (applies discount off first order for new members). Delivery modules should be loaded for royal mail, hermes and other uk delivery methods. Currency should be uk £, $ and € - ability to auto convert currency from external site. Multi language should be an option – not needed for release as no multi language translations currently, should be scale able to go multi language in future. design and layout needs acceptance by way of mock up that bidder will need to create - if a mock is created as part of the bid that is acceptable this will go a long way to becoming awarded the project. ref sites - [login to view URL] [login to view URL] [login to view URL]