Coming along nicely Andy. Will there be an enemy figure hiding out in the sewer? Great to see the progress pictures. Wish everybody would do a little more of this!
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If you have a go at the wall, be sure to add a cement color between the individual stones.
If I may offer a tip here. When I painted my wall for the cover-up dio I tried something that I was very pleased with. For the wash I used a very light grey pastel dust, some light grey tamiya acrylic ( a few drops) and diluted both with Isoproponal ( tamiya thinner would do). Then I stirred and stirred until the pastel disolved as much as possible and then used this as the wash. It gives a 100% flat cement look, fills up the crevice nicely and dont worry if leaks out. Using a damp coton bud wipe away, leaving a concrete-like residue on the painted bricks. Totally convincing. This was my last step.
I painted all the bricks using different shades of brick red mixed with browns, leather and flesh. And the occasional brick with dark grey for contrast. Washed them all a few times with burnt umber and black and dark green. I kept my colour lighter so when the washes were added i didnt end up with a black or very dark wall.
Hope this gives you some ideas.