Conservation of mass: Ruin + rubble = ?

So when a building becomes a ruin, all the blown up stuff doesn't just get vapourised, we're talking explosives not phasers. So for my ruined buildings I've used all the waste pieces, fragments and broken chunks. I even cast a couple of extra building parts in plaster then broke them up. All these extra broken pieces need to make up the missing parts of the ruins.

Of course, that also means painting all the rubble as well because that's a lot of exposed broken brick work. It's just a tiny bit possible that I assumed that the white plaster on the walls of these houses was pretty damn resilient and mostly survived the shelling and stayed plaster-white.
I also added a load of course balast mixed with fine and medium and some sand. This all went in a tub with the brown paint mix and got a good stir. I left that to dry and then broke it all up and mixed some of the finer white plaster fragments back in.

All this created a reasonably convincing (from a distance, one eye closed) collection of rubble which I laid out across the building bases. Spent far too long "gardening" this stuff but it seemed fairly important to get right. In most of these ruins the roofs come down, that's a lot of rubble. I so want to make a Flintstone's joke now, but I will remain strong.

The big pieces were glued in with PVA and superglue, depending on how fricking awkward it was, then I followed that up with a misting of PVA + water for the finer stuff, then spent the rest of the evening prising my superglued fingers apart.
I'm still painting too, experimenting with what looks terrible mostly. Nuln oil wash in the craters is way too dark, as you can see above. So now I've got to lighten that up. But I'm still moving forward.