eCommerce Community Marketplace - Similar to Zazzle

Looking to build a full eCommerce Community Marketplace similar to Zazzle/Spreadshirt with a few tweaks. Product Requirements: - Similar style of the Flash/PHP/MySQL product customization application found on " [login to view URL] ". Must be able to Resize and Rotate uploaded image. Psd Layout provided Note: Will provide coder with all product image layers required to accomplish similar visual effect with our products along with all product/image output specs) The rest of the site should will be a Community Marketplace similar to [login to view URL] General Users/Buyers should be able to save custom projects and be able to save and view them later, purchase them later. **Note** I want only select users to be able to sell their own products and access the seller's back-end Sellers should be able to: -Customize Commission rates per product, -Have their own backend whereby they can view royalties of their sales for month/day/year. -Have their own customized seller page that they can edit their avatar, about me blurp and products. PSDs of the site design will be provided. API Integration: Shipping: UPS, must be able to prepay taxes of item when using this method(rate depending on user country/state/province location) Canada Post, etc Payment Gateways SSL Integration Required: User Sign In, User Registration User/Seller Backend: Viewing of Sales, Viewing Purchase History Checkout/Purchases Similar Sites: [login to view URL], [login to view URL], [login to view URL], [login to view URL]