Customize existing shopping cart script (paypal based)

About us: We just started with freelancer but our account on elance is: BaltimoreRehab and we have 29 Jobs Awarded and member since October 2003. We also have odesk account: bri_inc and we have 929 Hours Billed on 28 jobs filled since we started the account on September 14, 2010. All positive feedback. ------------------------------- This project: Change existing shopping cart script and allow users to create portfolio pages. This advertisement gives a basic idea/overview of what we want to create: [login to view URL] ----------------- You are effectively changing a script that we will purchase so users can use it as a gallery(meaning nothing is for sale) or they can use it as it was intended as a store front. We will bill them a small fee per month for each work they want listed. Everything will be through paypal, so when customer pays them for the art it goes to their paypal account, and when we bill them we submit the invoice through paypal. No CC processing etc. ----------------- So if they want to use it as a portfolio they can create a custom menu, upload banner and upload artwork. It needs to re-size teh images to set parameters when they upload the jpegs. There will be a limit of 30 images or if they want more they can subscribe (billed by paypal invoice). The second part is the sales portion, but we are going to buy a script for this: [login to view URL] You will be making changes to this script but the overall functionality and appearance will remain the same. We want to integrate it into the portfolio so users can choose which works they want to offer for sale. We will need you to customize it. For instance, not only do we want a buy it now button, but we want users to be able to submit an offer. Most of the changes will be minor additions and not changing the main functionality of the script. Even after this initial project is finished we would like to find someone that we can continue to work with to further develop the script as the site grows. (Site is hosted on godaddy Windows server.)