Cook sushi rice. Whisk eggs in a bowl. Add sugar in the egg and stir well. Pour some of the egg mixture into a large frying pan and make thin omelet. Make another thin omelet. Slice the omelet thinly into strips. Slice cucumber into thin strips. Put imitation crab meat in a bowl and mix with mayonnaise. Place plastic wrap on the inside of a round 6-7 inch cake pan. Spread salmon slices on the bottom of the cake pan. Put 1/3 of sushi rice on top of the salmon and flatten the rice. Spread cucumber strips / avocado slices and imitation crab over the rice. Put 1/3 of sushi rice on top of them and flatten the rice. Spread egg strips on top of the rice. (*leave some egg strips for garnishing.) Further, put 1/3 of sushi rice on the egg strips. Cover the rice with plastic wrap and put a weight on the top. After 10 minutes, cover the cake pan with a large plate and turn them over. Remove the cake pan and plastic wrap. Garnish some egg strips on top of the salmon.