PHPRunner Modifying shopping cart template

For those familiar with the PHP Runner Shopping Cart Template, I need to modify the shopping cart template to act like a signup for events, where I will have both participants and show organizers signing into the system, where organizers will have the ability to "create items" aka "events" and set the different levels offered, and various pricing, as well as have an area where they can enter their banking information, which is masked, and only I can see as the "super admin" for lack of a better term. Also, need to allow then to upload and require different options/fields for participants signing up. Also need to add custom fields to participants profile, where they can upload documents and add different items like horse names, etc. which they then can select from a drop down when entering and paying for a competition. I then need the ability to, add certain information to another phprunner project, when, payment has been approved.