Jim,
Getting the 3-D effect (relief) with carbon transfer using digital negatives involves the same principles needed with analog negatives, i.e. subject matter, negative of the right contrast, tissue with the appropriate pigment loading, a sensitizer matched to the negative and tissue, and an appropriate final support paper.
It won't help you much in California, but in the Toronto area Bob Carnie at Digital Elevator has some of my work. I also have a few prints on consignment at the Paul Paletti Gallery in Louisville.
I am not going to claim that making high quality carbon transfer prints from digital negatives is easy, but about 90% of the skill is in the process itself, the other 10% in image scanning, image processing, and making the digital negative.
Sandy
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