Hi
I have reviewed your project description and it looks very interesting for me.
I am a Unreal Engine 4 developer and I have developed many projects using Unreal Engine 4.
Also i have good experience in developing VR Tour App using 360 panoramic images.
In Result, I think my skills would be help for your VR Tour App and also I am sure I can complete what you want.
If you want a good result, please feel free to contact me anytime.
Best Regards !