Corail Platform

The payload calculation starts from the outlined block(s) and spreads testing the 6 directions on a solid block state.

Ferryboat

Sunk Ship Salvage

Try to move it to all directions. A motion is triggered by redstone power and directed to the side of source. Use simple button or lever to test.

Ender Ship

Build simple ferry 1

Making ferries or elevators be 100% sure it works removing the repeater.

All blocks are connected via solid blocks.

One block isn't outlined.

Add left and right turn rotors. The block is side sensitive. Right power clockwise rotation, left counterclockwise.

Test where the waterline is

Build simple ferry 4 - outlined

Make sure highest construction point not lower than entity head to move with.

Sunk Ship Salvage

Install some automation. Always use signal delay when tuning.

A payload collecting is limited by outline

Payload below the lowest outline is ignored

Use any shape. Keep all necessary payload covered by the outline block.