Simple E-commerce Website required

I require a website to be built to be hosted on windows and/or linux server. Either server is ready and available. Allow customers to select a template products that they want to customize, have the customer participate in a questionnaire to collect customized values or text that needs to be merged into the template, complete payment checkout , register new user/login in, generate the custom template in .doc or .rtf format and email the customer the link to download the completed customized template. I need to have the ability to login as administrator and add new templates and create the questionnaire specific to that template and also insert the variables inside the template, set the price. back end type features to add/change website content etc. Ability to generate group templates (eg customer buys 3 templates or one set of templates that includes several templates. Common data is used in the questionnaires and no repeat questions are made to the customer. The templates are generated as a group of documents to be downloaded as a group. Functions or concept to be similar to this site: [login to view URL] NOTE: you will only need to build the website with payment processing and communicate with portal where the templates are already stored. Document assemble engine is already in place with the portal and you will not need to build this. I will provide all the API documentation which will allow you to insert iframe code to communicate with the portal with to trigger the creation of the completed template. IMPORTANT ***** IF YOU DO NOT HAVE THE EXPERT SKILLS TO DO THIS PROJECT FROM START TO FINISH AND YOU CANNOT COMPLETE THIS PROJECT BY THE DEADLINE - DO NOT BID ON THIS PROJECT ***** DEADLINES WILL NOT BE EXTENDED AND YOU NEED TO DEMONSTRATE THAT YOU HAVE DONE PROJECTS BEFORE THAT CAN DEMONSTRATE YOUR EXPERT SKILLS