UNITY 3D/UNREAL I need help in creating a Virtual 3D vehicle models and environment

Design details: 1. The idea is to have a small Sandbox like environment (a room perhaps) wherein the 3D car model will be placed in and the viewer can at his own discretion move around and about or inside the 3D car model. 2. There is no gameplay or anything. The idea is to have a 3D car model inside a room like environment and viewer can freely walk around and interact with car. It has to be a VR/AR mix. 3. The UI is being designed. But you may have to look around for 3D models of cars/motorcycles we prefer. We want it to be as photorealistic as possible, and to reflect an actual real car model and its variants. We also would like to have it implemented for VR use. PLEASE NOTE: THE DEADLINE FOR THE PROJECT IS DECEMBER 20th, 2016. Thanks, Alay