ecommerce site: clothing with custom print order

We are in early inquiry to find company that can build a custom website for banners/ sign industry business. Key components Requirement: 1. Storefront built for selling customized clothing and other promotional products (Product + design) 2. Catalog that can allow for multiple categories and sub-categories and allow for products to be associated with more than one category 3. Facilitate ordering for groups (size and color grid) with tier pricing for both product and decorating service 4. Ability to offer private stores with subset of products for companies, groups, and events 5. An instant price (quick quote) application - see attached 6. Ability to showcase the various decorating methods, design services, and design ideas 7. Administrative content management system 8. Customer account management system to include designs, projects (including proof approval), orders, email auto responders, etc [login to view URL] to create landing pages for specific purposes please suggest platform to use. also look at bluecottondotcom to review similar funtionalities other items applicable based on several website samples that we will give to shortlisted candidate. Please apply ONLY if you have had experience on this scale of project and have prior experience with portfolio of similar project that you have done before so we are not wasting time. Give realistic time frame, estimate range of costing depending on options and other factors that we need to consider. thank you