Thanks, Fred!
Here are some questions that I need answers for, so I can get started:
What exact dimensions do I need for a photo to be wrapped around a Sierra tube?
Are there specific papers and inks that make for better photo casting?
Is there a good adhesive for attaching paper to the brass tube?
Are there any potential problems with paper being cast right to the edge of the tube - can moisture seep into the paper if the tube is submerged in water?
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I'd like to try a photo to the edge of the tube and another with a slightly smaller photo with the tube painted at the edges, like a color border for the photo.
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It's funny how much thought occurs to me after I post. Sorry to make this more complicated - I just hadn't figured out how ignorant I am of casting, until I had posted my first question.