It would be nice to be able to see the altitude / heading ILS indicators as one of the customizable instruments at the bottom, perhaps as a crosshair. When using the HUD-2 view, I often have to switch back to HUD-Full to check that I am still on the ILS.
You can’t do anything with the HUD-2 view except for watching the A/P flying your plane :P
I suggest you to use HUD-1, there is no need to have the minimap on the left.
Pretty much all the information HUD-Full provides, except for map and ILS, is available in the bottom instrument panel. You also have use of all the flight controls just as you do in all the views. HUD-2 is the most realistic view, working instruments are replaced by the panel, all it needs is ILS indications.