In-network content caching allows content to be located towards the edge of the network, closer to users. This approach addresses the challenge of exponentially increasing video traffic. We consider OpenCache: an open-source, highly configurable, efficient and transparent in-network caching that leverages Software Defined Networking (SDN) to benefit last mile environments. However, due to its reliance on a centralised OpenCache controller and SDN controller, it suffers from three issues: scalability, reliability and high availability. In this work, we build on and extend the capabilities of OpenCache as a caching solution by leveraging Network Functions Virtualisation (NFV) and using a distributed SDN controller. We discuss the architectural design and technology decisions for the caching platform distribution including the functional components and highlight the role of virtualising, orchestrating and managing the key processes of caching content and control functions. Our target is to design an open-source, distributed in-network caching platform that is highly available, reliable and with automated elasticity to enable serving the increasing VoD traffic quickly and efficiently.