Thanks for your input. I have tried what you have suggested with halftone lith film and A&B developer. The problems that I am having, in addition to the adjacency effects, is not being able to come up with a high enough contrast mask. There is still some continuous tone present. I am presently researching higher contrast materials in an attempt to gain a sharp enough mask. I know that this technique is possible since I have met a photographer that utilizes this to produce incredible prints. The ability to alter contrast in the toe and shoulder portions produces a greater sense of openess and apparent light within the print. Thanks again, please feel free to comment if you have further thoughts.