How to do this GUI

Hello Geniuses out here!

I’m new with unity but kind a in hurry to learn so i can pitch on a big job!
Im pushing my luck here, If some one can suggest a script for a GUI which do something like this :

(i animate that for reference)

and its gonna be touch input in windows 7 output to 30" LCD TV with NExtWindows Touchscreen Overlay.

I manage to rotate that ring, but how do i click each of the buttons inside that rigidbody? urmmmmmmm

Try Physics.Raycast and RaycastHit…coupled with Input.touches, should be what you’re looking for.