Hello sir. I have 6 years of game programming experience and more than 3 working on Unity, I'm sometimes the top ranked freelancer in Unity3d. You can see some of my previous works on my portfolio. About this project:
1) I haven't worked with gyroscope before, but from what I see it's just another input and is natively implemented in Unity so I don't think that would be a problem at all
2) Sure, don't know what's that waiting list for but no problem there. I've worked with php server connections before using unity WWW classes and Json as protocol for passing data in both directions.
3) Ok, if it requires a lot of synchronization with the server I can implement a Unity Networking system, or even Photon. But if it's only sending results then it's better just to handle request with WWW.
For what I understand you have all the required assets. If that is so, I can probably lower the price. Please contact me if you're interested in my offer.