This morning I got the following pictures from Patrick. He had drawn a 2x2 and printed it out already.
I've ordered 8 pieces of 6* 4x4 and 2 pieces of 12* 2x2 for starters. My intention is to make ruined blocks of 4 pieces back to back in a square, with some trim around the edges as a sidewalk, and then expand to bigger pieces like 3 or 4 in a row, back to back, or with a central courtyard. The bits will be easy to manipulate, being cardboard, and can be put together in a variety of ways.
Now to get pictures of the Stalingrad granary and plan a copy-ish of that in 3mm :)