Develop A Unity Game In C#

I am working on a Wild West, sandbox building game. The following extract is taken from our Kickstarter campaign: "Imagine yourself in a breathtaking Western landscape, with the power to transform it sitting at your fingertips. Frontier places you in an awe-inspiringly beautiful worldspace, and gives you the ability to make a name for yourself in the West. Gather resources, hunt for food, cook a wide variety of dishes, and survive in the West. But that's only the beginning. In fact, Frontier isn't even primarily a survival game, it's just one of the many features which we will offer you. Once you've gathered enough resources to begin crafting, you can create floors, walls, roofs, furniture, vehicles, railroads... the list goes on and on. Frontier is based on a reputation system, where you must try to gain fame in the West. You begin as a nobody, and develop your character based on your actions. You may decide to build a thriving community by taking things into your own hands, and constructing a settlement. If you connect your town to the rail network, settlers will begin to arrive by train. You can amass your fortune by presiding over your own frontier town. But the game does not limit you to just that- you can become a rich cattle baron, if you choose, or perhaps a world-renowned bounty hunter. Frontier provides you with countless opportunities to conquer the West. Combat is also an important feature of the project. You will be able to defend your settlements from bandit attacks, coyotes and bears, and even Native tribes! Construct a wide range of authentic weaponry, from Colt revolvers, to Winchester repeaters. Take up arms and protect your people! From building structures, to claiming bounties, every action your complete in Frontier will affect your reputation. The more famous you become, the more opportunities that will become available to you. Losing settlers will decrease your reputation, so make sure that you defend your people well. Your sheriff's department will assist you with this task, so you aren't left to fend for your towns alone!" I need a programmer to implement all of the aforementioned features, which range from allowing the player to instantiate objects in a 3D grid, and creating a voxel terrain-editing system, to designing a procedural Western terrain generator, and making some GUIs (inventory and stats). I will also need some NPC AI to be constructed.