Hi Paul, The pv frame goes right on the stern over the centre dc shute note it has a fairlead on top, it was for towing the parvaine,and towing in general, It is shown clearly in the last few of my photos with the ensign staff along side it. as for the aft gun deck shelter as you have seen from my pics I closed the front in I figured it would not be much of a shelter if it were open.