Viz.Pick and Viz.Intersect on GUI elements?
 

Is this possible? I have been just making my GUI using 3D objects with textures but it looks terrible.

Is this functionality possible? I know Viz.Pick can be replaced with onbuttondown but I need Oculus HMD compatibility on the element with intersection

Use a GUI canvas to display GUIs on the Oculus. See my post here about using the canvas and virtual mouse cursor.