Google released its first set of guidelines for developers hoping to participate in Project Ara, the company's platform for building modular smartphones. The first version of Project Ara's Module Development Kit was released Wednesday. The idea behind Project Ara, first unveiled in October by the company's Advanced Technology and Projects (ATAP) Group, which is technically still part of Motorola, is to create a platform where any given part of a smartphone is its own module that can be replaced independently so users can completely customize the look of their device. Google has already revealed the modular phones will come in small, medium and large sizes. The development kit includes guidelines detailing the requirements for individual components of the phones like processors and batteries. "This is a very early version, but our goals are to give the developer community an opportunity to provide feedback and input, and to help us ensure that the final MDK ? anticipated at the end of 2014 ? is elegant, flexible and complete," Paul Eremenko, Google's head of Project Ara, said in a blog post. The release comes just ahead of the first Project Ara Developer's Conference, which will be held next week in Mountain View, Calif. At the conference, developers will have a chance to provide feedback on the development kit and learn more about what features Google has planned for the platform. The entire conference will also be live streamed for developers who wish to participate remotely.