In a small bowl, mix the nori, sesame seeds, sugar, sesame oil and a large pinch of salt. In another small bowl, mix the tamari, rice vinegar and wasabi powder. Using a Spiralizer slicer, cut the zucchini and cucumber into noodle-like strips, or use a vegetable peeler to cut the vegetables into ribbons, then use a knife to cut into strips.
Divide the rice among 4 bowls. Top with the zucchini and cucumber "noodles," salmon, carrots, edamame, cilantro and scallions. Top with the nori mixture and the tamari mixture.