SS1 tourer Hood, Hood Envelope and Tonneau cover

Can anyone help on exactly how the hood on an SS1 Tourer folds down and probably over the back of bodywork and sits on luggage box? and the hood envelope goes over it and whilst they probably never had a full length tonneau cover certainly one factory car has half length tonneau cover
has anyone got photos of one with the hood envelope built in in and any suggestions etc.
Hood envelope is almost certainly as per the XK120 140 and 150 DHC piped in matching trim colour leather
thanks terry