written guide or schematic

It sounds like you're asking for a (a "paper") for a "lovely craft piston trap" that is 30 blocks wide at the top .

Difficulty:

Intermediate Components: 4 Sticky Pistons, 4 Observers, 16 Redstone Dust, 4 Repeaters, 4 Sand Blocks.

Q: Do these "lovely craft piston trap 30 top" designs work in Bedrock Edition?

A: Most of them do! However, Bedrock redstone is slightly different (quasi-connectivity doesn't exist). For designs using observers and pistons pushing tile entities, test in creative first.

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