This doesn't have to be zencart or oscommerce but these applications seem to have most of the functionality already in them. Part of my business involves allowing users to upload digital images to my site and for us to professionally print them. We offer lots of print techniques/products. So the user selects a product they're interested in and are guided to an orders page where they can upload their image
Site needs to be able to handle prices at product attribute level, file uploaded, gift vouchers and some basic trade customer application form.
I have mocked the site up in static html to help the coder with design and flow. Obviously, this comes with all the required images etc. I just need the site to look exactly like the mocked up version. I am always on Yahoo and will provide full support for the coder.