Mobile app where users paint directly on 3D objects, with social component

I have an app ready for production and I need a skilled and dedicated programmer to complete it. The basic features: This is an app that will need simple drawing/painting functionality including layers. Users will paint and apply images directly onto a 3D object. Users will then have the option to save and share their designs. I would like to set up an Instagram-style social component where users have an account and can post their designs. Some must-have functionality specifics: - Painting component with: color picker, shape tool, line tool, brush tool (with 4-5 different brushes and sizing options), simple layer functionality with ability to move a graphic up/down to different layers. Ability to select a graphic and apply it to the 3D object, then activate the graphic to move it around. - Live painting onto the 3D object (with ability to select different pre-determined angles for the object). - Render the 3D object for user controlled viewing - Instagram-style social function where user has an account, can post renderings of their painted object, users can "Like" other user images, "Abuse" reporting system, ability to me to moderate and select the best designs. - In-App purchases for additional 3D objects and paint brushes. - "Voting" function in the social area where I can put 3 user designs against one and another for users to vote on the best. - Ability to export/import designs. - Social Share for Fb, Tw, Instagram. You will NOT need to do the following things, so please do not include them in you pricing: - 3D models - I will provide all 3D objects. - Graphic Design - I will provide all artwork as layered PSD files for your use. Please answer these questions in your first communication with me. I will not consider anyone who does not answer these: 1) Which 3D engine would you use - Cocos3D or Unity 3D or another? 2) I have found a source code for Instagram - do you think that will be something to use or do you think you need to create social aspects from scratch?