Finally all the wall engravings are done, and after a whole lot of procrastination I've decided to go with paving slabs for the street levels,
using the same technique with a dremel but more random:
This means I can start detailing streets now with piles of rubble and patches if dirt. Dead excited now!
Also during my procrastination I've built a couple of buildings.
Doing these now has helped me figure out size and shape eg: distance per floor
Plus I got one painted to test the colours, still needs a bit of weathering yet and stains but I'm happy with the colours.
This is one which will overlap the street