Coppermine Ecommerce Modification

I need a Coppermine modification for a personal print website. Keep in mind that there is a system very similar to this already built and can be found here: hxxp://[login to view URL] The image page needs to have several options for different print sizes/types with prices varying. These should be set trough the admin, otherwise a default value is used. There should also be a setting that an image is not for sale. Also as an option should be where they want the artist to sign the image. The shipping cost is the same for all the images (fixed), coupon discounts. All those three features in the paragraph are already built in the mod above. The form data needs to be on the image page itself and must be easily modifiable. There should be a templateable "shopping cart" table (displaying amounts in shopping cart and a link to the checkout/shopping cart) somewhere in the design. A plus would be that this information is useable outside of coppermine. The desired payment processors are Paypal, 2Checkout & Stormpay with the ability to turn an individual processor on/off. (i am waiting for paypal's ability to transfer funds in my country) Payment will be released upon working demo. Please send samples of work (if you have done similar projects before) and all questions trough the PM rather than the clarification board (cause I dont get emails in the clar.b.).