New Website for Supplier and Purchaser portal

This is a new website design and development project for a Supplier and Purchaser portal. Simple, practical and easy to use interface is preferred. The portal will be built in 2 languages (English & 1 other language). We will provide the content in both languages. The left side of the main screen will be meant for the Purchasers and the right side is planned for Suppliers. Working model: Both Suppliers and Purchaser will have to register, get approved first and then will be able to login into their respective login sections. Different users will have different levels of access. There will be 6 main pages on the website. In addition to this, there will be a total of 6 forms (questionnaires), i.e. 5 forms for collecting data from Suppliers and 1 form form the Purchaser. The suppliers must also be able to upload files. Total number of Purchasers will be around 200 and total number of Suppliers is expected to be around 500. The Purchasers should be able to query and/or click on standard reports, which are based on data collected from the Suppliers. There will be 3 types of memberships (Silver, Gold, Platinum) for the Purchaser, during their registration phase and an associated membership fees. Membership fees can be paid via Visa/Master/Amex/PayPal by the Purchaser. We need to have this payment functionality on the site. There is NO service fee or membership fee for the Suppliers. To be clear, this portal is mainly for connecting the Purchaser with the Supplier and the membership fees charged are meant for our web portal service only. No product is sold, so we do NOT need a 'shopping cart' type design.