Opencart Customisation

We need a product page customisation on our store, based on OpenCart platform. We already have about 200 products added and the extension needs to work with future products also. First Task: It is a product options customisation and most of the products use the same options. There are 5 different options for some contact lenses categories and a lot of values for the above mentioned options. There are max 3 options for LEFT EYE and 3 options for RIGHT EYE contact lenses while some have only the dioptry option with the values. In the specific category there should be a checkbox near the options and when clicked, another 1 option for LEFT EYE and 1 option for RIGHT EYE appears in the table. Once configured in the backend the user/client in the front end must have the option to buy only left or right if he doesn’t want to buy a pair of lenses. You can see the working example here: h**p://[login to view URL] (the part for dioptry and cylinder and stuff for left and right eye). Second Task: The check out process has to be exactly like the above site. First Leg =>Delivery Method First we need to have a radio button to select the delivery method which is UPS/DHL or Packstation. If the second one is selected then two textfields are required: 1) Postnummer, 2 Packstations . Second Leg=> Payment Method Two cases : If in first leg the Packstation is selected then the only payment method available will be PapyPal otherwise there are three PayPal, Vorkasse and Nachname which shows a message of additional charges.(Message will be provided) Third Leg => Checkout Confirmation Full analysis of the left or right contact lense(if one has been selected) and the ability to change: address, Name and delivery method. Also two check buttons that are required to complete the process and ship the product(message will be provided) Additionally we would like a search box by brands and by dioptries as well. Check also the screenshots provided. For further clarification please contact us.