Here it is so far. Worked up a displacement map for the bricks, but they still look to square/new.

This scene, which doesn't appear that heavy, is taking a half an hour to save, 10 minutes to load, and after I let carrara run to render this last night my comp was about locked up this morning. Render was done, carrara was using no amount of the CPU but nearly 7 gig of ram. I had to force close carrara because it was totally unresponsive; not sure how I managed to save the render.