The original recipe uses fresh compressed yeast, which is not readily available to a home baker, not is it practical for a home baker. If want to us fresh yeast, you will need 3/4 oz or 20 grams for this recipe. In the original recipe the author recommends rolling the dough out to 1⁄16 inch (2 mm) thick. You may want to experiment and decide for yourself whether you like your crackers thinner or thicker. In the original recipe the author advises to bake the crackers until deep golden brown. Be sure not over-bake as they tend to taste a little bitter if baked too much. I'd recommend to experiment a little and pick the color that corresponds to the best tasting crackers to you.