419584 Shopping cart large mod

I require these mods and cart functions, --- [login to view URL] -- copy and paste I mocked up site with instructions in html 1) By clicking on middle of each page you will go to next step 2) each page describes job and should make clear the coding required 3)) if any confusion PM me and I will gladly answer and questions in detail! my choice of carts are prestashop or satchmo, Although prestashop may be easier to mod, satchmo, django, and python may be a better platform to build on. comments are welcomed. You may bid using either platform, all details are on the link above for requirements. Only bid please if your a high level programmer offering web 2.0 functions, clear coding, documentation of coding, and are really an expert, otherwise its pointless you fail and I am unhappy. This job is for experts only, as its difficult and I am demanding.