Custom WordPress Shopping Cart Application

I have a customer that is a distributor of anesthesia and respiratory supplies that needs a new site. It is the standard shopping cart site with a product catalog, shopping cart and checkout, but there are some custom needs that may require some PHP programming and MySQL work. For example, there is a related items display when someone clicks a product. Product families may share product images. The Item display window may also have a video associated with it that can be selected from the item display window. The site will use column pricing. There is a complete PDF specification that I will provide, but I want to stress one important thing. If you have no idea how to do the above functionality, please do not waste my time or yours. This is very likely to not be the type of application where you can bolt up a handful of Wordpress plugins and do the job. A custom WordPress theme will be required. bear in mind when bidding that your competitors may be using Artisteer and bid accordingly. I want a professional job with a 12 month software warranty at a reasonable price. If you are up for the task, read the attached PDF specification and respond to this request with a quote. The spec has been reviewed by the customer and he agrees that this is exactly what he wants. There is a great potential for more work too. The business is very dynamic and growing, so the customer may add more functionality over time.