multiple auction site

Requirements for Site We want to develop a place where buyers and sellers can trade. There will be only one product, but different classes of this one product. Upon registration, the seller will have to create a profile and also would have to submit some paperwork via uploading from their computer for approval. The buyers would also register and would also have to upload and submit their information for approval. Once approved, the seller will then be able to list their product for sale. There would be multiple auctions going on simultaneously, and they can all be reached from the main interface/homepage. Once a buyer chooses an item, the sellers inventory would then show the effects of the sale. For eg. The seller has 5 items, a buyer bids and wins, after the buyer wins, the sellers items will then display 4 items. For the most part the features would be very similar to ebay such as rating system, and profile pages for buyer and seller. The only difference is that their would be “auctions” by a product type. And there would probably be no more than 12 products total, but may be more. Again, each product would have it’s own auction. If this is something you can develop, and have a portfolio, please bid. Thank you…