Add seasoned rice vinegar to warm cooked rice. Add 1-3 TBSP of the rice vinegar. Taste and adjust. Sometimes the vinegar can be overpowering so start small and gradually add. Mix well and let it cool for a bit. Take your finely chopped crab meat and divide it. With the first one add enough mayo to your liking (1-3 TBSP). With the second one add mayo and sriracha. Take your bamboo mat and place one nori sheet with the shiny side down. Add enough rice to cover the sheet and add sesame seeds on top. Flip over. Add your crab meat, sliced avocado, and sliced cucumbers. Roll it all up and slice it into 8 pieces. Repeat. Enjoy!