It's easiest to prep ingredients first and then assemble. The cream cheese should be refrigerated for at least half an hour prior to assembling. I often do all the prep work the night before / hours before. Cucumbers should not be sliced until ready to assemble & serve.
Remove cream cheese from packaging. Cut the block of cream cheese in half length wise and transfer to wax or parchment paper. Wrap and roll it (think like a rolling pin) to round out the cream cheese. Keep cream cheese wrapped and chill in refrigerator for at least half an hour. (This rolling process makes the cream cheese super soft. Chilling for at least half an hour sets it up nicely for when you need to slice it. )
Cut crab legs into matchstick sized pieces. I find it easiest to cut the stick into thirds. I then cut each section into 4 or 5 pieces. Refrigerate until ready to use.
In a small bowl, mix together mayo & sriracha.
When ready to assemble: peel cucumbers and slice into about 1/2" thick pieces.
Cut rounded cream cheese into 1/4" slices. Put cream cheese rounds on top of cucumber slice.
Place 2 cut crab sticks on top of cream cheese, gently pressing the crab down into the cream cheese. You can get creative on how you do this - but keep in mind that you want to be able to pick this up and eat it without it falling apart. I do some criss-cross, most pieces I lay the crab side by side.
Drizzle spicy sriracha mayo on top of sushi pieces.
Keep refrigerated. This is best when served fresh to within a few hours from preparation.
Notes
Photos in blog post for reference:Rounded cream cheeseCrab sticks cut into "matchstick" size piecesAmount of pieces will vary depending on size & thickness of cucumbers and cream cheese slices.