Cut all the fishes into long strips.
Wash the cucumber, then rub it with some Kosher salt. Let sit for a couple minute before lightly rinse.
Use a peeler to slice cucumber into thin lengthwise strip.
Divide the usable of similar width cucumber slices into two, and basket weave into rectangular shape wrapper.
Have a plastic wrap on a flat surface then place this weaved cucumber wrapper on top.
Spread 2 nigiri size rice ball along one side.
Now arrange all the fish, avocado and crab sticks.
Drizzle some sriracha and Kewpie mayo if you like the taste and a little extra spice, otherwise just keep. The sauce do give better binding for ingredients.
Carefully wrap and roll the wrapper into roll, as the weaved wrapper quite delicate, make sure the plastic is wrapped around the whole roll.
Wrap a saran wrap around the roll for easier cutting. Use a sharp knife to cut into piece while plastic wrap still on.
Carefully unwrap each piece.
Serve with some wasabi and garnishment.