Gee as a person who's processed film but never really got around to printing much. This sounds over complicated. I figured you covered one section of the paper and placed something to create the lines over the paper then exposed it. Then covered the next place then exposed it. Then printed the picture. If I was going to do that the tricky part is to lign up the paper correctly. Are you sure that was the best way to do what you did? Bsteph