Basic osCommerce modification

The project as it is very simple, but due to limitations of time I cannot dedicate time to investigate how to do it. The project is intended for an already built osCommerce application and it can be explained in 7 easy steps: 1) I want to be able to upload an image (or many) to the order Admin processing section. 2) When I upgrade the order to "Delivered" status I want that image I uploaded before to be sent along with the automatic "Delivered Confirmation" E-Mail that is sent by the system, as an attachment. 3) When the image is sent it must be stored in the order history as a link, so it can be accessed for future times. 4) Customers should be able to see that image from their account orders menu. 5) Customers should be able to see ONLY their images associated with their orders, not other customer's images' from other orders. 6) I would prefer if this could use JavaScript to show the images when the customer clicks the link, as well as when the admin clicks the link in the admin section. 7) I would prefer if this could be made as a contribution Add-On with every step documented and a very brief explanation of what every function and method does just in case I need to adjust something in the future. We are building a site, so probably the person who works with us might get additional work if he desires it. Thanks for your time!