when I think of old cherches I think of lots of stone work, and the difrent kinds of stone.. could you be a liittle more discriptive of the clay look ?

If I was doing something for clay I would make it pritty smoth but have a rel blured bump for that fingered afect. you could layer in some cracks for pavemnt if its dryed out.. and like a sandstone texture for the bump whare some had bean chiped away..

or is the clay more like fired clay ?

if you like we could try to work it out hear in this thread.. (shrugs)