(Yeah, I couldn't think up any more imaginative title)
The architecture is based on "Cathedral" by Zuendholz, see http://www.blendswap.com/blends/view/2259. However, that was made for Blender Internal, so I wiped all materials and made some minor polishing to make it fit for cycles.
Clothes meshes are done via cloth simulation.
Render time on my newly-built rendering machine was 40 minutes for 5000 passes.