Hi leducvu,
I have to agree with the guys - transferring full walk-throughs to mobile VR will require you to make significant sacrifices. The detailing of textures and polygons that a smartphone can process will not allow you to be too elaborate with customization/detailing of your design…
Thats why I prefer panorama based VR - no restrictions on the level of detailing and photorealism.
For inspiration, I suggest you check out theConstruct.co and the stuff they do. They have apps like theArchitect and theShowroom, which aim to create immersive walkthroughs on smartphones, but even those are fairly primitive, compared to nice 360 images