Oscommerce - Prices from matrix

This project involves the modification of OSCommerce to be able to sell blinds/curtains from the site. In selling blinds, product is priced based on the size of the product. A particular blind of 50 inches wide by 60 inches tall has a price point from a matrix (not linear or priced per area), and the same price may apply to a 48 by 62, but a 75 inch wide blind will cost more. Blinds of different sizes are priced based on these two dimensions, plus a few other feature attributes. There would by a priced size and an actual size attribute that would be important to carry. We need an update to the site that would include a box where customers can enter the width in inches and the height in inches, and will have a few other minor price based attributes. This data will then be passed to the shoping cart for purchasers. There will also need to be an administrative backend to enter new products and edit the price information. This description is general to allow you to create a bid, but there are more details that you must employ, such as relation to the rest of the site, integration into the other pages, and more. You must be cautious to not interupt the function of the site. Changes and new functions must be marked and described as per coding standards. We can refer, by PM, to a few sites that exist for you to have more information of what we want.