Update:
The top floor, with the 'svalgång' (swallow's perch as is Swedish nomenclature) or gallery is taking shape. The on duty guard room and supplies crane will be sitting right at the edge. A lot of the gallery will be blown away so as the basic construction has been put in place, there will be a lot of broken timber and debris has to be strewn convincingly about the place.
I've lovingly roughened up all timber (hobbyist linden and fir) with a steel brush and carved it here and there to make it look hand fitted and aged. I spent some time on the arrow slits and their doors, making them work with micro iron work and everything, just because I cant stop myself.
A crossbowman peeking out of the cargo hold/guard room-to-be. The XPS sheeting will be embossed with masonry pattern eventually and the corners and apertures dressed with woodwork or cut stone imitation. I will make something dangle from the cargo beam to, I think.
Detail of the inner walls of the gallery and and arrow slit cover.
Now to the other end of the holdfast: the floor of the first floor and the grating covering the throat to the hellish obliette below.
The grating can be opened like so...
The vault of the ceiling in the oubliette.