thank you for your comments.
Sorry for the delay to publish new photos. I've spent time in order to open the "pilot's door". There is two micro-servos, but they are linked with an Y futaba wire.
The first one has the link with the door itself and the second is used to move the figure. The door is 2 cm high and 1 cm width.
I'm ready to work on the bow thruster. But I have a question, on the photo and the plan, there is no gate to protect the bow thruster . When I look to the boxw thruster size, I wonder if this one has not been moved in dry dock.