Custom OpenCart Shipping Module

***************************************************************************************** I am only looking for someone who is experienced with OpenCart extensions ***************************************************************************************** I need a shipping option, that allows for collection from multiple locations (which can be set via backend option page) I have found one that does this, [login to view URL] but it only has a fixed fee per collection. However, I need to be charging a set fee PER ITEM.... (as the locations are different sailing events around the world) so for example, £1 per item, 15 items purchased for collection = £15 shipping fee. If someone can modify the above extension to do so, or create their own extension... that will be perfect. - During checkout, it should display a list of Events (Locations) each with a clickable radio button. - The price per item will be 80p... and will not change depending on location. Many Thanks