Poject Degreen

I want a robust ecommerce web applicaton/site with multi tenant/vendor access from the admin panel. ecommerce website that will have the following requirements; Login, Order, Search, Item details, Stock, Add to cart, Checkout, Payment, Credit check, Order status, currency conversion, Shipping and Confirmation. The system should support sending e-mail and SMS.13. Pricing (by the admin) by percentage of category, manufacture and/or item.14. Multi-Users (Some users will be allowed to buy just with an invoice and some users will be required to pay on-line). For example when pressing manufactures my client's site(s) send a query to the web service and the response is shown on the GUI interface of my client's site. I will also want this site to import files from different suppliers XML/API feeds/integration, like items, update pricing, and other basic information. I think some suppliers don’t support online service in other words the files will be imported daily. Most of my client's products will have the same code even when buying the same item from different suppliers. So the pricing should be based on lowest price in catalog and the correspondent Order should be sent to the right supplier (the one with the lowest price). This website should be capable of calculating shipping cost for international order based on the weight. More information will be provided. To whoever is awarded the job. It should be able to support different forms of payment such as PayPal, master cards and credit cards. I have a link to the supplies web service: [login to view URL] Here it is more or less an example of a site that works similar to what I need; [login to view URL] Please kindly provide a detailed proposal for the building and implementation of this site. I will like an Amazon Design with some tweaking for the store front. Here is a magento Admin link that i will like to have