I've had experience in the full product development cycle with several companies of varying sizes. In order to get early funding, you need to prove that the concept works, with some information about what it will look like. A working prototype is different than an aesthetic model, and will require more capabilities from your prototype supplier. There are companies out there that specialize on the "one off" type of solution. I would actually look at a 3D model for aesthetic purposes and then go with a very stripped down working prototype to save money and time. Let me know if you would like to discuss further.