Production of working prototype and 3d cad

I am in the process of trying to develop a working prototype and 3d cad drawings which I can use to potentially generate interest from customers and investors in order to secure orders and investment. The product is an easy to use modular accessory for kids buggies, pushchairs and car seats but can also be used as a stand-alone outdoor accessory at the park, beach or play area. I have a product specification and some sketches which I would email once the contract is secured. I intend to apply for a patent once I have confirmed the technical detail so in the meantime all shared information is subject to a non-disclosure agreement.