Cook sushi rice according to package directions.
Mix vinegar, sugar, and salt together well.
Add vinegar mixture to warm rice gently.
Let rice cool to room temperature completely.
Chop cooked shrimp into small bite-sized pieces.
Mix shrimp with mayo, sriracha, and lime.
Slice avocados and dice cucumber into pieces.
Place cookie cutter on serving plate firmly.
Layer rice in bottom of cutter first.
Add spicy shrimp mixture as second layer.
Top with avocado slices and cucumber pieces.
Sprinkle sesame seeds and nori on top.
Gently remove cookie cutter from stack carefully.
Repeat process for remaining servings immediately.