Hi,
Greetings from HD Minds.
We are a group of passionate techies committed to AUGMENTED REALITY, virtual reality and unity 3d development. Our Lead Unity AR/VR developer has official unity certification, also VR development training experience.
We will be able to help you with creating VR walkthrough for google cardboard. Tell us about the specific requirements and we shall work with you.
Please have a look at our freelancer portfolio to know about some of our Augmented reality works.
Regards
HD Minds