Combine zucchini and salt in colander. Set aside for 30 minutes to drain. Squeeze out excess moisture.
In food processor, combine zucchini, 3 1/4 cups flour, whole wheat flour and dill weed if using. Pulse to combine.
In bowl, mix water and yeast, stir until foamy and dissolved. Stir in 3 tbsp olive oil.
With processor running pour water mixture through feed tube and process until it forms a ball. Continue processing for 1 minute to knead dough. Remove dough to floured board and knead for 5 minutes, adding flour as needed.
Place dough in oiled bowl and let rise for about 1 hour.
Punch down dough and cut in half. Stretch dough to fit 2 oiled pizza pans. Dimple surface (press heavily in circular motion to make holes. Cover and let rest in warm place for about 30 minutes. The holes will slightly close on the bottom and leave dimples on top.
Generously brush the top of one focaccia with oil so that it pools in the dimples. Sprinkle with kosher salt.
Bake in 500 degree oven for 12 -15 minutes til top and bottom crusts are golden.