The finished ruin with lots of errors.
As usual, I learned plenty while constructing and, in particular, painting the model.
The overhead view shows two sections of floorboards though I doubt there would be many left after hundreds of years defending the place.
They'd have all gone for firewood, I mean, it does look a bit drafty.
One thing I'd do on construction is to glue the two sheets of foam card together and then cut through them, eliminating the 'ridge' of card in the center.
The big two on painting is spray grey rather than black and think about painting walls before assembly.
There are some tricky corners when it's assembled.
Also, you need texture everywhere - not just on the exterior walls
The close up shows the wallpaper pavement which I think works well.
The last shot shows how not to go about it.
I tried painting in Fortress grey and then dry-brushing white.
Dawnstone spray, then work up to white through Fortress grey, I think.
Do watch out for melting foam in the boards.
I protected the walls with 'Dark Earth' but filler/glue mix would have done the job while texturing.
The loose wall sections were protected with glue which failed to work.
I had to fill them up again with filler/glue.