Hi, I'm an unity game developer, and have some experience with VR.
The project is not that complicated and it is possible for finishing it in 7 days + 14 days of support.
Currently I dont have a HTC Vive, only an Oculus Rift
As far as I know, Unity handles both, Oculus Rift and HTC Vive, pretty similar.
Is that will be a problem for you?
Other than that, my questions would be:
1) There will be any kind of motion in this app presentation? I mean, the user will be allowed to move forward or backwards, sideways?
2) The Ambient Sound would be stopped when the Information Sound will be presented or just turn the volume down?
If thats ok, I would be willing to start the project as soon as you make the pre payment.
Reminding, that I do not receive the pre payment... thats just a guarantee.