That is crazy. I can't even imagine how many hours go into that. I'm more of an MDF/Bondo/orbital sander guy myself. Clay seems like it would be too soft to work with. Do you also use a contour gauge or digital caliper?
Lol. It's therapeutic to me so I don't mind so much. I'm definitely pro Bondo/mdf when it comes to props though. Working with clay, you just have to regulate its temperature to get it to the right feel for you. And i don't use a gauge (prob should), or a digital caliper. Like i said, I mostly eyeball everything.