With a little bit of experimenting, I came up with this:
Just test driving it a while to see how I like it. What do you think?
I found it very easy to trace the image from behind the light fabric, but it was very difficult to see through the dark fabric. Even with a bright light behind it. So devised a template that can be traced from the top of the fabric.
I had used my handy-dandy plastic margarine container lid. Once I had traced the pattern on the lid, I cut out an approx. 1/8th inch slit where the pencil marking was. It is in these slits that I'm going to mark my fabric.
I'll try it out for a while and once the quilt-top id finished, I'll have to mark each and every 225 square blocks!!