Question Camera stacking (and avatar layer)

In a VR app I added camera stacking so that my player pop-up UI menu appears in front of the landscape but there seems to be one issue. If I raise my avatar's hand I can see thru it and see the buttons on the UI menu. Ideally (I think) I would like the UI menu to be in front of everything in the room with the exception of my avatar and I suppose things my avatar might be holding.

Does this involve another camera? Some ordering of layer's or something else entirely?
Thanks.