Annie,
Sorry no one has answered your question yet... and the worst part is, you're stuck with my less-than-veteran insight..
For one, how are you going to make contact negatives in that size? That would be problem numero uno.
Secondly, the question of adhesion to the distressed steel is an open one. I can't say whether the tooth would hurt or help, but my gut says it will hurt. The carbon
transfer relies on two very smooth surfaces (usually both gelatin, or maybe ceramic/melinex/glass/etc.) that form a kind of suction to one another.
I suspect a direct process like gum might be better for distressed steel, but honestly I have no idea. Just hate to see an interesting idea go uncommented on...
You'll still have the problem of finding really large negatives, which might not be a big problem if there's a budget for this.
best,