Convert existing Shopify site to Opencart

This project entails rebuilding [login to view URL] using the Opencart framework. In addition, we require a subscription module enabling customers to be delivered drinks at set times each week. Recurring credit card payments via DPS ([login to view URL]) will be used for this eg. the PxPost API. Experience with Opencart is vital for the selected developer. Also, we require good time management as we want to get this up and running as fast as we can (within reason of course!!). We would like the developer to also use strict PSR-1 and PSR-2 guidelines with their coding. If a great job is done there will be plenty of more work :)