Here are the tiles painted with that grey/green and laid as if broken up, mostly in doorways.
I should have laid the 'Dark Earth' first and then laid the tiles but I'll build up the Dark Earth before dry brushing.
It's all starting to take shape and we have plenty of rubble and damaged wall to sprinkle about.
To prop up the back wall we considered buttresses but abandoned that having realised that it's the side walls that will need buttressing more than the end one.
One of those GW statues would have been perfect and our headless substitute looks rather small to me.