Good Timing Yoram!
I have been waiting for Ilia to get back online because I am having problems transfering cartoons and pouncing. I usually use a light projector and/or grid but this is more difficult with fresco.

The problem is that the holes in the paper seem to be clogging. I have tried drafting mylar, bond paper, and tracing paper. The tracing paper seems to give the best holes (I am using 15 per inch - the coarsest wheel) but the mistake was the intonaco was a little too moist.

My friend, a frescoist called Ed Sawatzky, unfortunately not online, seems to have much the same background as you - trained in Florence, Mexico and Israel. He uses a wooden float on the intonaco and the rolls it out after painting with a seamless bottle or tube of steel he had made. He advocates using butchers paper and then tracing the lines with terre verde green earth pigment. This is a 16" x 16" and is a test subject. My reference is attached. You don't use a grid? Any tips?