I managed to get 30 minutes of full immersion without any leakage

For screwing use M3 screws. for seals use TPU, I used 35D, the softer the better. use some kind of dense sponge as a cable seal. i used a piece of fitness mat, you can also try from a puzzle type mat (the kind used for children's floor)

F3D file is included so adjust the size and number of wires

The sizes that are used now fit the TRX4 and the DumboRC X10F receiver