I honestly don't have the time to learn the ins and outs of the Hash materials system, I'm sure it would take me at least a week to come up with a clay shader. I am kind of in a rush to finish this project, I have given myself til the end of August to see what I can get done, if at that point its done, great. If not, I have a good start. I do have an extra machine for rendering, but again, that is not quite the point.
Anyway, the point is not the shaders, the point is does it look ok now, or should I scratch it and start over? would you model it differently? I started with the entrance and then just started extruding it back and pulling points. I used to copies of the entrance hole to do the extrusions so that I could extrude a partial interior.