101737 Mod To Freelancers Script

Hello, I am considering buying a copy of the Smarter Scripts "Freelancers" script. Before I do, I want to find out how much it would cost for a certain mod to be done. First, I want the script to maintain ALL of it's existing features but need the following added. This addition should be COMPLETELY independant of the original script. My site will not be the normal "webmaster" and "freelancer" type site. It will be for "buyers" and "sellers." Along with being able to create projects for a buyer and a seller, I need the sellers to also be able to sell electronic products (ebooks & reports). The twist with ability to sell an electronic product is that the seller should be able to specify a specific quantity sold. So if the seller specifies that they will be selling 10 copies, the the script should keep that project active until all 10 copies are sold. Again, the script should maintain it's current ability to create such a project, allow the buyer to make payments using the scripts existing functions, provide feedback, and etc but it should stay open until the specified quantity is sold. The ebooks should show on the mainpage differently that the normal projects. I will need to be able to create categoreis (Dating, Make Money, Health, and etc). So it won't show it a table in decending order but rather it should show categories and subcategories and indicate how many ebooks are for sale in each category. I hope that makes sense. Please use the PMB if you have any questions. Also, when you bid, please let me know if you have experience with doing mods to the Smarter Scripts Freelnacer script. Thanks!